Regents Test Review

1
Regents Test Review

• Chin-Sung Lin

2
Math Measurement
3
SI Units

• The standard (SI) unit for mass is the _________,
  represented by _________.
• The SI unit for length or distance is the
  _________, represented by _________.
• The standard (SI) unit for time is the _________,
  represented by _________.

4
SI Units

• The standard (SI) unit for mass is the _________,
  represented by _________.
• Kilogram kg
• The SI unit for length or distance is the
  _________, represented by _________.
• Meter m
• The standard (SI) unit for time is the _________,
  represented by _________.
• Second s

5
SI Units
Variable Symbol Unit
Mass
Distance
Time
Velocity
Acceleration
Force
6
SI Units
Variable Symbol Unit
Mass m kg
Distance d m
Time t s
Velocity v m/s
Acceleration a m/s2
Force F Kg m/s2 or N
7
Significant Figures

• The higher the degree of accuracy in a
  measurement, the greater the number of
  ___________ we can use for that measurement.

8
Significant Figures

• The higher the degree of accuracy in a
  measurement, the greater the number of
  ___________ we can use for that measurement.
• Significant Figures

9
Significant Figures

• How many significant figures are in the following
  numbers?

Numbers Significant Figures
0.45
0.01
130
9004.7
607
130.
10
Significant Figures

• How many significant figures are in the following
  numbers?

Numbers Significant Figures
0.45 2
0.01 1
130 2
9004.7 5
607 3
130. 3
11
Significant Figures

• Calculate the following, taking significant
  figures into account
• (203.7m)(76m)
• (8.967kg) / (2.3kg)

12
Significant Figures

• Calculate the following, taking significant
  figures into account
• (203.7m)(76m)
• 15000 m2
• (8.967kg) / (2.3kg)
• 3.9

13
Significant Figures

• How many significant figures are in
• 2.3 x 1014 m
• 5.684 x 103 s

14
Scientific Notation

• How many significant figures are in
• 2.3 x 1014 m 2
• 5.684 x 103 s 4

15
Scientific Notation

• (3.45 x 1012 m) (1.6x 108 m)
• (7.8 x102 kg) (6x102 m)

16
Scientific Notation

• (3.45 x 1012 m) (1.6x 108 m) 5.5 x 1020 m2
• (7.8 x102 kg) (6x102 m) 5 x 105 kg m

17
Scientific Notation

• Solve (4.5 x 1015 kg) (3.34 x 104 m) / (6.7s)2

18
Scientific Notation

• Solve (4.5 x 1015 kg) (3.34 x 104 m) / (6.7s)2
• 3.3 x 1018 kg m/s2 (or N)

19
Kinematics
20
Distance Displacement

• What is the difference between distance and
  displacement?
• Which is a vector?
• Which is a scalar?

21
Distance Displacement

• What is the difference between distance and
  displacement?
• Which is a vector? displacement
• Which is a scalar? distance

22
Distance Displacement

• If an object moves 2m north, then 4m east, then
  2m south, what is its distance traveled?
• What is its displacement?
• (Be able to solve mathematically or graphically)

23
Distance Displacement

• If an object moves 2m north, then 4m east, then
  2m south, what is its distance traveled? 8 m
• What is its displacement? 4 m, East
• (Be able to solve mathematically or graphically)

24
Distance Displacement

• If an object travels 6m west, then 5m south, What
  is its distance traveled?
• What is its displacement?
• (Be able to solve mathematically or graphically)

25
Distance Displacement

• If an object travels 6m west, then 5m south, What
  is its distance traveled? 11 m
• What is its displacement? 8 m, 40o South of
  East
• (Be able to solve mathematically or graphically)

26
Speed Velocity

• What is the difference between speed and
  velocity?
• Which is a scalar?
• Which is a vector?

27
Speed Velocity

• What is the difference between speed and
  velocity?
• Which is a scalar? Speed
• Which is a vector? Velocity

28
Speed Velocity

• What is the average speed of an object which
  travels 63m in 3.4s?

29
Speed Velocity

• What is the average speed of an object which
  travels 63m in 3.4s?
• 19 m/s

30
Speed Velocity

• What is the average velocity of an object that
  moves 57m, N in 3.1s?

31
Speed Velocity

• What is the average velocity of an object that
  moves 57m, N in 3.1s?
• 18 m/s, North

32
Acceleration

• If an object goes from rest to 60. m/s in 15s
  uniformly, what is its average speed?
• How far will the object travel in those 15s?
• what will be the objects acceleration rate?

33
Acceleration

• If an object goes from rest to 60. m/s in 15s
  uniformly, what is its average speed?
• 30. m/s
• How far will the object travel in those 15s?
• 450 m
• what will be the objects acceleration rate?
• 4.0 m/s2

34
Acceleration

• What is the average speed of an object that
  accelerates uniformly from 3.6 m/s to 5.7 m/s?

35
Acceleration

• What is the average speed of an object that
  accelerates uniformly from 3.6 m/s to 5.7 m/s?
• 4.7 m/s

36
Acceleration

• How far will an object going 6.3m/s travel in
  16.7 s?

37
Acceleration

• How far will an object going 6.3m/s travel in
  16.7 s?
• 110 m

38
Acceleration

• What is the acceleration of an object which
  uniformly changes its velocity from 6.6 m/s to
  18.4 m/s in 8.2 s?

39
Acceleration

• What is the acceleration of an object which
  uniformly changes its velocity from 6.6 m/s to
  18.4 m/s in 8.2 s?
• 1.4 m/s2

40
Acceleration

• If an object uniformly accelerates from rest and
  it takes 6.8s to cover a distance of 72m, how
  fast will It be going at the end of those 6.8s?
• What is the rate of acceleration?

41
Acceleration

• If an object uniformly accelerates from rest and
  it takes 6.8s to cover a distance of 72m, how
  fast will It be going at the end of those 6.8s?
• 21 m/s
• What is the rate of acceleration?
• 3.1 m/s2

42
Acceleration

• How far will an object go in 9.7 s if it starts
  from rest and undergoes a uniform acceleration of
  2.9 m/s2?

43
Acceleration

• How far will an object go in 9.7 s if it starts
  from rest and undergoes a uniform acceleration of
  2.9 m/s2?
• 140 m

44
Acceleration

• When an object is slowing down, the value of its
  acceleration will be ____________ ( or -).

45
Acceleration

• When an object is slowing down, the value of its
  acceleration will be ____________ ( or -).
• negative (-)

46
Linear Motion

• What is the final velocity of an object after
  6.0s if it starts from rest and accelerates at
  4.3 m/s2?

47
Linear Motion

• What is the final velocity of an object after
  6.0s if it starts from rest and accelerates at
  4.3 m/s2?
• 26 m/s

48
Linear Motion

• What is the final velocity of an object after a
  distance of 216m if it has an acceleration of 3.6
  m/s2?

49
Linear Motion

• What is the final velocity of an object after a
  distance of 216m if it has an acceleration of 3.6
  m/s2?
• 39 m/s

50
Linear Motion Graphs

• In a displacement-time graph, the slope equals
  the objects _____________________.

51
Linear Motion Graphs

• In a displacement-time graph, the slope equals
  the objects _____________________.
• Velocity

52
Linear Motion Graphs

• In a velocity-time graph, the slope equals the
  objects ________________________.

53
Linear Motion Graphs

• In a velocity-time graph, the slope equals the
  objects ________________________.
• Acceleration

54
Linear Motion Graphs

• In a velocity-time graph, the area beneath the
  curve equals the objects ________________.

55
Linear Motion Graphs

• In a velocity-time graph, the area beneath the
  curve equals the objects ________________.
• Displacement

56
Linear Motion Graphs

• Sketch the displacement-time graph that shows an
  object with a non-zero constant velocity

57
Linear Motion Graphs

• Sketch the displacement-time graph that shows an
  object with a non-zero constant velocity

58
Linear Motion Graphs

• Sketch the velocity-time graph for an object
  undergoing uniform positive acceleration

59
Linear Motion Graphs

• Sketch the velocity-time graph for an object
  undergoing uniform positive acceleration

60
Linear Motion Graphs

• Sketch the velocity-time and acceleration-time
  graphs for the given displacement-time graph

61
Linear Motion Graphs

• Sketch the velocity-time and acceleration-time
  graphs for the given displacement-time graph

62
Linear Motion Graphs

• Sketch the d-t and a-t graphs for the given v-t
  graph

63
Linear Motion Graphs

• Sketch the d-t and a-t graphs for the given v-t
  graph

64
Linear Motion

• Whats the final velocity of an object that
  starts at 5.9 m/s, and accelerates at 4.0 m/s2
  for 2.8s?

65
Linear Motion

• Whats the final velocity of an object that
  starts at 5.9 m/s, and accelerates at 4.0 m/s2
  for 2.8s?
• 17 m/s

66
Linear Motion

• How far will an object travel if it starts from
  rest and accelerates at 7.82 m/s2 for 9.0 s?

67
Linear Motion

• How far will an object travel if it starts from
  rest and accelerates at 7.82 m/s2 for 9.0 s?
• 320 m

68
Linear Motion

• What will be the final velocity of an object that
  starts at 1.5 m/s, and accelerates at 6.3 m/s2
  for a distance of 72m?

69
Linear Motion

• What will be the final velocity of an object that
  starts at 1.5 m/s, and accelerates at 6.3 m/s2
  for a distance of 72m?
• 30. m/s

70
Free Falling

• What is the rate of acceleration due to gravity?
  (neglecting air resistance)
• What is it represented by?

71
Free Falling

• What is the rate of acceleration due to gravity?
  (neglecting air resistance)
• 9.81. m/s2
• What is it represented by?
• g

72
Free Falling

• When an object is dropped from a height of 28m.
  how long will it take to hit the ground?
• how fast will the object be going when it hits
  the ground?

73
Free Falling

• When an object is dropped from a height of 28m.
  how long will it take to hit the ground?
• 2.4 s
• how fast will the object be going when it hits
  the ground?
• 23 m/s

74
Free Falling

• How fast will an object be going after 6.4 s when
  it is dropped from rest?

75
Free Falling

• How fast will an object be going after 6.4 s when
  it is dropped from rest?
• 63 m/s

76
Free Falling

• How fast will an object be going after 6.7 s when
  it is dropped with an initial downward velocity
  of 1.9 m/s ?

77
Free Falling

• How fast will an object be going after 6.7 s when
  it is dropped with an initial downward velocity
  of 1.9 m/s ?
• 68 m/s

78
Free Falling

• Is the force of gravity a vector or a scalar?

79
Free Falling

• Is the force of gravity a vector or a scalar?
• Vector

80
Free Falling

• If it takes a thrown object 1.7s to go as high as
  it will go, how long will it take to come back
  down?

81
Free Falling

• If it takes a thrown object 1.7s to go as high as
  it will go, how long will it take to come back
  down?
• 1.7 s

82
Free Falling

• How far will an object fall in 5.8s?

83
Free Falling

• How far will an object fall in 5.8s?
• 170 m

84
Statics
85
Forces

• The study of forces at rest is _______________.
• The unit for force is the _______________.
• 1 Newton results in a mass of _____kg having an
  acceleration of ______m/s2.
• Are forces vectors or scalars?

86
Forces

• The study of forces at rest is _______________.
• Statics
• The unit for force is the _______________.
• Newton
• 1 Newton results in a mass of _____kg having an
  acceleration of ______m/s2.
• 1, 1
• Are forces vectors or scalars?
• Vectors

87
Forces

• Draw a force of 4.5N pulling due east on an
  object.

88
Forces

• Draw a force of 4.5N pulling due east on an
  object.

F 4.5 N
East
89
Vectors

• Two or more forces acting on an object at the
  same time are called ___________________ forces.
• A single force equal to two or more concurrent
  forces combined is called the ________________.

90
Vectors

• Two or more forces acting on an object at the
  same time are called ___________________ forces.
• Concurrent
• A single force equal to two or more concurrent
  forces combined is called the ________________.
• Resultant

91
Vectors

• At what angle should two concurrent forces be to
  obtain the smallest resultant?
• At what angle should they be to obtain the
  largest resultant?

92
Vectors

• At what angle should two concurrent forces be to
  obtain the smallest resultant?
• 180 0
• At what angle should they be to obtain the
  largest resultant?
• 0 0

93
Vectors

• What is the greatest resultant obtainable with
  two concurrent forces of 4.8 N and 2.3N?
• Whats the smallest?

94
Vectors

• What is the greatest resultant obtainable with
  two concurrent forces of 4.8 N and 2.3N?
• 7.1 N
• Whats the smallest?
• 2.5 N

95
Vectors

• Forces are added ________ to __________.
• The resultant can be found graphically, or if the
  two concurrent forces are at right angles, the
  resultant can be found using the
  _________________________________.

96
Vectors

• Forces are added ________ to __________.
• Head, Tail
• The resultant can be found graphically, or if the
  two concurrent forces are at right angles, the
  resultant can be found using the
  _________________________________.
• Pythagorean Theorem

97
Vectors

• If a force of 5.5N acts due west on an object
  while another of 7.8N acts due north, what is the
  magnitude of the resultant?
• What is the direction of the resultant?

98
Vectors

• If a force of 5.5N acts due west on an object
  while another of 7.8N acts due north, what is the
  magnitude of the resultant?
• 9.5 N
• What is the direction of the resultant?
• 55 o N of W

99
Vectors

• Using the parallelogram method, find the
  resultant (magnitude and direction) of a due
  south 18N force and a due east 26N force.

100
Vectors

• Using the parallelogram method, find the
  resultant (magnitude and direction) of a due
  south 18N force and a due east 26N force.
• 32 N, 35 o S of E

101
Vectors

• Just as concurrent forces can be combined into a
  resultant, a single force can be _______________
  into two or more _______________ forces.
  Commonly, these are the X and Y components.

102
Vectors

• Just as concurrent forces can be combined into a
  resultant, a single force can be _______________
  into two or more _______________ forces.
  Commonly, these are the X and Y components.
• Resolved, Component

103
Vectors

• What are the X and Y components of this force?

104
Vectors

• What are the X and Y components of this force?
• X 13.4 N, Y 10.1 N

105
Equilibrium

• The force equal in magnitude but opposite in
  direction to the resultant is called the
  _______________________.

106
Equilibrium

• The force equal in magnitude but opposite in
  direction to the resultant is called the
  _______________________.
• Equilibrium

107
Equilibrium

• Draw a free-body diagram for this problem and
  solve mathematically A rod pushes with a force
  of 61N on a cable that holds an 84N sign. If the
  cable is at 36 o to the building, what is the
  tension on the cable?

108
Equilibrium

• Draw a free-body diagram for this problem and
  solve mathematically A rod pushes with a force
  of 61N on a cable that holds an 84N sign. If the
  cable is at 36 o to the building, what is the
  tension on the cable?
• 104 N

109
Equilibrium

• If a 22N box sits on a 32o ramp, find the
  parallel and perpendicular forces mathematically.

32 o
22 N
110
Equilibrium

• If a 22N box sits on a 32o ramp, find the
  parallel and perpendicular forces mathematically.
• Parallel 12 N
• Perpendicular 19 N

32 o
22 N
111
Equilibrium

• An object is being held up by two ropes, 120o
  apart from each other and 120o from the object.
  What is special about the tension on the ropes in
  this situation?

112
Equilibrium

• An object is being held up by two ropes, 120o
  apart from each other and 120o from the object.
  What is special about the tension on the ropes in
  this situation?
• The tension on each will equal the weight of the
  object

113
Equilibrium

• If a girl is pulling on a sled rope with a force
  of 24N at an angle of 47o to the ground, find the
  horizontal and vertical components of her force.

114
Equilibrium

• If a girl is pulling on a sled rope with a force
  of 24N at an angle of 47o to the ground, find the
  horizontal and vertical components of her force.
• Horizontal 16 N
• Vertical 18 N

115
Dynamics
116
Newtons Law of Motion

• Dynamics is the study of forces affecting objects
  that are in ____________________.
• In one word, describe Newtons First Law of
  Motion _______________________.

117
Newtons Law of Motion

• Dynamics is the study of forces affecting objects
  that are in ____________________.
• Motion
• In one word, describe Newtons First Law of
  Motion _______________________.
• Inertia

118
Newtons Law of Motion

• An object that has no net force acting on it may
  be at _______________, or may be moving at
  _________________.
• If there is an unbalanced force, the object will
  ____________.

119
Newtons Law of Motion

• An object that has no net force acting on it may
  be at _______________, or may be moving at
  _________________.
• Rest, Constant Velocity
• If there is an unbalanced force, the object will
  ____________.
• Accelerate

120
Newtons Law of Motion

• What will be the acceleration resulting from a
  6.7N force acting on a 8 kg mass?

121
Newtons Law of Motion

• What will be the acceleration resulting from a
  6.7N force acting on a 8 kg mass?
• 0.8 m/s2

122
Newtons Law of Motion

• What force is needed to accelerate a 345 kg
  object at 2.3 m/s2 ?

123
Newtons Law of Motion

• What force is needed to accelerate a 345 kg
  object at 2.3 m/s2 ?
• 790 N

124
Newtons Law of Motion

• By definition, one Newton

125
Newtons Law of Motion

• By definition, one Newton
• The force required to accelerate a 1 kg mass at
  1 m/s2

126
Newtons Law of Motion

• If you weigh 100N and sit on a chair, with what
  force is the chair pushing on you?

127
Newtons Law of Motion

• If you weigh 100N and sit on a chair, with what
  force is the chair pushing on you?
• 100 N Upward

128
Newtons Law of Motion

• Whats the difference between mass and weight?
• As an object travels from Earth to the Moon, what
  happens to the objects mass and weight?

129
Newtons Law of Motion

• Whats the difference between mass and weight?
• Mass amount of matter. Weight gravitys
  affect on that matter.
• As an object travels from Earth to the Moon, what
  happens to the objects mass and weight?
• Mass stays the same. Weight depends on g.

130
Newtons Law of Motion

• What is the weight of an 18.4 kg object?
• What is the mass of a 34N object?

131
Newtons Law of Motion

• What is the weight of an 18.4 kg object?
• 181 N
• What is the mass of a 34N object?
• 3.5 kg

132
Newtons Law of Motion

• If two objects of 36 kg and 24 kg are accelerated
  with equal forces, which will have the greater
  acceleration?

133
Newtons Law of Motion

• If two objects of 36 kg and 24 kg are accelerated
  with equal forces, which will have the greater
  acceleration?
• 24 kg

134
Newtons Law of Motion

• If two objects of different mass are dropped from
  a window, how does the force of gravity on each
  compare?
• How do their accelerations compare?

135
Newtons Law of Motion

• If two objects of different mass are dropped from
  a window, how does the force of gravity on each
  compare?
• Different
• How do their accelerations compare?
• The same

136
Newtons Law of Motion

• Is mass a vector or a scalar?
• Is weight a vector or a scalar?

137
Newtons Law of Motion

• Is mass a vector or a scalar?
• Scalar
• Is weight a vector or a scalar?
• Vector

138
Newtons Law of Motion

• If a 67 kg person weighs 300 N on a different
  planet, what is the gravitational acceleration on
  that planet?

139
Newtons Law of Motion

• If a 67 kg person weighs 300 N on a different
  planet, what is the gravitational acceleration on
  that planet?
• 4 m/s2

140
Friction
141
Friction

• What are the two types of friction and how do
  their magnitudes compare?

142
Friction

• What are the two types of friction and how do
  their magnitudes compare?
• Static (Starting) Greater
• Kinetic (Sliding) Less

143
Friction

• What is the normal force?

144
Friction

• What is the normal force?
• A force acting perpendicular to the surface or
  opposite to the weight

145
Friction

• How does the magnitude and direction of the
  normal force compare to the magnitude and
  direction of an objects weight?

146
Friction

• How does the magnitude and direction of the
  normal force compare to the magnitude and
  direction of an objects weight?
• Equal in magnitude opposite in direction

147
Friction

• How does the direction of the frictional force
  compare to the direction of the applied force?

148
Friction

• How does the direction of the frictional force
  compare to the direction of the applied force?
• Opposite in direction

149
Friction

• If Fa is the applied force, draw and label the
  other three forces

Fa
150
Friction

• If Fa is the applied force, draw and label the
  other three forces

FN
Fa
Ff
Fg
151
Friction

• The frictional force can be _________than or
  __________ to the applied force, but never
  ______________than it.

152
Friction

• The frictional force can be _________than or
  __________ to the applied force, but never
  ______________than it.
• Less, Equal, Greater

153
Friction

• What is the coefficient of friction?
• What is its symbol?

154
Friction

• What is the coefficient of friction?
• The ratio between the frictional and normal
  forces
• What is its symbol?
• µ

155
Friction

• If an applied force of 6.2 N keeps an object
  moving at a constant velocity, what is the
  frictional force?

156
Friction

• If an applied force of 6.2 N keeps an object
  moving at a constant velocity, what is the
  frictional force?
• 6.2 N

157
Friction

• Whats the formula used to find the frictional
  force when the weight and the coefficient of
  friction are known?

158
Friction

• Whats the formula used to find the frictional
  force when the weight and the coefficient of
  friction are known?
• Ef µ FN

159
Friction

• If a 16 N object has a coefficient of friction of
  .23 with a tabletop, what is the frictional
  force?
• If a force of 5.0 N is applied, what will be the
  net force?
• What will be the resulting acceleration of the
  object?

160
Friction

• If a 16 N object has a coefficient of friction of
  .23 with a tabletop, what is the frictional
  force?
• 3.7 N
• If a force of 5.0 N is applied, what will be the
  net force?
• 1.3 N
• What will be the resulting acceleration of the
  object?
• 0.8 m/s2

161
Friction

• If a box is sitting on a ramp and not sliding
  down, the frictional force must be equal to the
  __________________ force. (perpendicular or
  parallel?)

162
Friction

• If a box is sitting on a ramp and not sliding
  down, the frictional force must be equal to the
  __________________ force. (perpendicular or
  parallel?)
• Parallel

163
Friction

• An applied force of 4.7 N is needed to keep a
  wooden object moving at constant velocity across
  a wooden floor. What is the weight of the object?

164
Friction

• An applied force of 4.7 N is needed to keep a
  wooden object moving at constant velocity across
  a wooden floor. What is the weight of the object?
• 16 N

165
Impulse Momentum
166
Impulse Momentum

• What is the symbol for momentum?
• What are the units?
• What is momentum?

167
Impulse Momentum

• What is the symbol for momentum?
• p
• What are the units?
• kg m/s
• What is momentum?
• A vector quantity that factors in the mass and
  velocity of an object

168
Impulse Momentum

• What is the momentum of a 13.8 kg object moving
  at 6.0 m/s?

169
Impulse Momentum

• What is the momentum of a 13.8 kg object moving
  at 6.0 m/s?
• 83 kg m/s

170
Impulse Momentum

• One 4 kg object moving at 3 m/s strikes an 8 kg
  object and stops (transfers all of its energy to
  the 8 kg object). How fast will the 8 kg object
  travel?

171
Impulse Momentum

• One 4 kg object moving at 3 m/s strikes an 8 kg
  object and stops (transfers all of its energy to
  the 8 kg object). How fast will the 8 kg object
  travel?
• 1.5 m/s

172
Impulse Momentum

• What is the symbol for impulse?
• What are the units for impulse?
• What is impulse?

173
Impulse Momentum

• What is the symbol for impulse?
• J
• What are the units for impulse?
• N s
• What is impulse?
• The change in momentum of an object due to a
  force applied over time

174
Impulse Momentum

• If a force of 15 N is applied for 3 s, what is
  the impulse produced?

175
Impulse Momentum

• If a force of 15 N is applied for 3 s, what is
  the impulse produced?
• 50 N s

176
Impulse Momentum

• A force of 9 N applied for 5 s to a 7 kg object
  will cause what change in the objects velocity?

177
Impulse Momentum

• A force of 9 N applied for 5 s to a 7 kg object
  will cause what change in the objects velocity?
• 6 m/s

178
Impulse Momentum

• When a rifle is fired, how does the momentum of
  the bullet compare to the momentum of the rifle?

179
Impulse Momentum

• When a rifle is fired, how does the momentum of
  the bullet compare to the momentum of the rifle?
• Equal in magnitude opposite in direction

180
Impulse Momentum

• If a 50 kg skater moving at 3.5 m/s strikes a
  100kg skater at rest, and they cling together,
  what will be the velocity of the pair?

181
Impulse Momentum

• If a 50 kg skater moving at 3.5 m/s strikes a
  100kg skater at rest, and they cling together,
  what will be the velocity of the pair?
• 1 m/s

182
Impulse Momentum

• If a 103 kg person standing on a frictionless
  surface throws a 6.2 kg ball at 7.8 m/s, with
  what speed will that person go backwards?

183
Impulse Momentum

• If a 103 kg person standing on a frictionless
  surface throws a 6.2 kg ball at 7.8 m/s, with
  what speed will that person go backwards?
• 0.47 m/s

184
Impulse Momentum

• If a 340. kg object traveling at 56 m/s collides
  head- on with a 170. kg going 112 m/s, what will
  be the result?

185
Impulse Momentum

• If a 340. kg object traveling at 56 m/s collides
  head- on with a 170. kg going 112 m/s, what will
  be the result?
• They will both stop because their momentums were
  equal

186
Gravity
187
Gravity

• What is the gravitational constant?
• What is its symbol?
• What are its units?

188
Gravity

• What is the gravitational constant?
• 6.67 x 10 -11 N m2 / kg2
• What is its symbol?
• G
• What are its units?
• N m2 / kg2

189
Gravity

• How do changes in two objects masses affect the
  gravitational force between them?

190
Gravity

• How do changes in two objects masses affect the
  gravitational force between them?
• The greater the mass, the proportionally greater
  the gravitational force

191
Gravity

• How do changes in the distance between two
  objects affect the gravitational force between
  them?

192
Gravity

• How do changes in the distance between two
  objects affect the gravitational force between
  them?
• It changes inversely with the square of the
  distance

193
Gravity

• If object A has a gravitational force of X on
  object B, and object Bs mass is twice that of A,
  what will be the gravitational force that object
  B has on object A?

194
Gravity

• If object A has a gravitational force of X on
  object B, and object Bs mass is twice that of A,
  what will be the gravitational force that object
  B has on object A?
• Still X

195
Gravity

• If one object has a mass of 47.5 kg, and a second
  object has a mass of 67.9 kg, and they are 24m
  apart, what is the gravitational force of
  attraction between them?

196
Gravity

• If one object has a mass of 47.5 kg, and a second
  object has a mass of 67.9 kg, and they are 24m
  apart, what is the gravitational force of
  attraction between them?
• 3.7 x 10 -10 N

197
Gravity

• If one mass doubles, the gravitational force
  becomes________ what it was.
• If the distance is doubled, the gravitational
  force becomes _____________ what it was.

198
Gravity

• If one mass doubles, the gravitational force
  becomes________ what it was.
• Twice
• If the distance is doubled, the gravitational
  force becomes _____________ what it was.
• one fourth

199
Work Power
200
Work Power

• What is the symbol for work?
• What is the unit for work?
• What is work?

201
Work Power

• What is the symbol for work?
• W
• What is the unit for work?
• Joule (J)
• What is work?
• Energy exchanged for movement

202
Work Power

• What is the symbol for power?
• What is the unit for power?
• What is power?

203
Work Power

• What is the symbol for power?
• P
• What is the unit for power?
• Watt (W)
• What is power?
• Rate at which work is done

204
Work Power

• By definition, 1 Joule equals ___________________
  ________, and 1 Watt equals_______________________
  ______.

205
Work Power

• By definition, 1 Joule equals ___________________
  ________, and 1 Watt equals_______________________
  ______.
• 1 N force moves an object 1 m
• 1 J of work done in 1 s

206
Work Power

• The less time it takes to do a certain amount of
  work, the ____________ power it takes.

207
Work Power

• The less time it takes to do a certain amount of
  work, the ____________ power it takes.
• More

208
Work Power

• If a 26N force moves an object 16m, how much work
  has been done?

209
Work Power

• If a 26N force moves an object 16m, how much work
  has been done?
• 420 J

210
Work Power

• How much work is done in lifting a 9.4 kg object
  3.5 m upwards?
• If this work was done in 4.7 s, what power was
  required?

211
Work Power

• How much work is done in lifting a 9.4 kg object
  3.5 m upwards?
• 320 J
• If this work was done in 4.7 s, what power was
  required?
• 69 W

212
Work Power

• If a bulldozer pushes against a building with 4.5
  x 1015 N of force for 52 s, but the building
  didnt move, how much work was done?

213
Work Power

• If a bulldozer pushes against a building with 4.5
  x 1015 N of force for 52 s, but the building
  didnt move, how much work was done?
• None

214
Energy
215
Energy

• Whats the difference between potential and
  kinetic energy?
• What are some types of potential energy?
• What are the units for energy?

216
Energy

• Whats the difference between potential and
  kinetic energy?
• PE energy due to position, KE energy due to
  motion
• What are some types of potential energy?
• Gravitational, elastic, chemical, etc.
• What are the units for energy?
• Joules

217
Energy

• Whats the potential energy of a 22.6 kg object
  located 16.89m above the ground?

218
Energy

• Whats the potential energy of a 22.6 kg object
  located 16.89m above the ground?
• 3740 J

219
Energy

• Whats the kinetic energy of a 7.2 kg object that
  is moving at 8.4 m/s?

220
Energy

• Whats the kinetic energy of a 7.2 kg object that
  is moving at 8.4 m/s?
• 250 J

221
Energy

• In any system, the loss or gain of potential
  energy ____________ the loss or gain of kinetic
  energy.
• Explain this idea using a pendulum.

222
Energy

• In any system, the loss or gain of potential
  energy ____________ the loss or gain of kinetic
  energy.
• Equals
• Explain this idea using a pendulum.
• At the top of its swing, a pendulums energy is
  all PE at the bottom of the swing, its all KE

223
Energy

• The potential energy plus the kinetic energy
  equals the total _____________ energy of the
  system. This energy, plus any ______________energy
  (symbolized by _________) equals the total
  energy of the system.

224
Energy

• The potential energy plus the kinetic energy
  equals the total _____________ energy of the
  system. This energy, plus any ______________energy
  (symbolized by _________) equals the total
  energy of the system.
• Mechanical, Internal, Q

225
Energy

• What is the difference between a conservative
  force and a non-conservative force?

226
Energy

• What is the difference between a conservative
  force and a non-conservative force?
• Conservative force path doesnt matter
• Non-conservative force path matters
• The gravitational force, spring force, magnetic
  force) and electric force are examples of
  conservative forces, while friction and air drag
  are classical examples of non-conservative forces
  (in both cases, the energy is converted to heat
  and cannot be retrieved)

227
Energy

• If a 15 kg object falls 6.3 m, what will be its
  loss of potential energy?
• What will be its gain in kinetic energy?
• How fast will the object be traveling at the end
  of those 6.3 m? (solve this two different ways)

228
Energy

• If a 15 kg object falls 6.3 m, what will be its
  loss of potential energy?
• 930 J
• What will be its gain in kinetic energy?
• 930 J
• How fast will the object be traveling at the end
  of those 6.3 m? (solve this two different ways)
• 11 m/s

229
Energy

• What is potential elastic energy?
• What is the spring constant?

230
Energy

• What is potential elastic energy?
• Energy stored in a stretched spring or other
  elastic material
• What is the spring constant?
• Describe how easy a spring is stretched

231
Energy

• Determine the spring constant

232
Energy

• Determine the spring constant
• 2 N/m

233
Energy

• If a spring is stretched .03 m by a force of .14
  N, what is the spring constant?

234
Energy

• If a spring is stretched .03 m by a force of .14
  N, what is the spring constant?
• 5 N/m

235
Energy

• What is the potential energy stored in a spring
  that is stretched .43 m (k1.38 N/m)?

236
Energy

• What is the potential energy stored in a spring
  that is stretched .43 m (k1.38 N/m)?
• 0.13 J

237
Two Dimensional Motion
238
Projectile Motion

• What is the horizontal velocity component of a
  golf ball launched at 21o and at an initial
  velocity of 24.6 m/s?
• what is the initial vertical component of the
  balls velocity?
• How long will it take the ball to reach the top
  of its trajectory?
• How long will the ball stay in the air? How far
  will it go?
• How high will the ball go?

239
Projectile Motion

• What is the horizontal velocity component of a
  golf ball launched at 21o and at an initial
  velocity of 24.6 m/s?
• 23.0 m/s
• what is the initial vertical component of the
  balls velocity?
• 8.8 m/s
• How long will it take the ball to reach the top
  of its trajectory?
• 0.90 s
• How long will the ball stay in the air? How far
  will it go?
• 1.80 s, 41 m
• How high will the ball go?
• 4.0 m

240
Projectile Motion

• When an object is thrown horizontally off a cliff
  at the same time another object is dropped from
  the cliff, which object will hit the ground
  first?

241
Projectile Motion

• When an object is thrown horizontally off a cliff
  at the same time another object is dropped from
  the cliff, which object will hit the ground
  first?
• Both will hit at the same time

242
Projectile Motion

• If an object is thrown horizontally from a 120m
  high cliff with an initial velocity of 21.3 m/s,
  how long will it take to reach the bottom?
• How far from the base of the cliff will it land?

243
Projectile Motion

• If an object is thrown horizontally from a 120m
  high cliff with an initial velocity of 21.3 m/s,
  how long will it take to reach the bottom?
• 4.9 s
• How far from the base of the cliff will it land?
• 110 m

244
Projectile Motion

• If an object takes 2.78 s to reach the bottom
  when thrown horizontally at 5.6 m/s off a cliff,
  how high is the cliff?

245
Projectile Motion

• If an object takes 2.78 s to reach the bottom
  when thrown horizontally at 5.6 m/s off a cliff,
  how high is the cliff?
• 38. m

246
Circular Motion

• Describe centripetal force

247
Circular Motion

• Describe centripetal force
• The force that, when combined with inertia,
  keeps object moving in curved paths

248
Circular Motion

• What is the symbol for centripetal force?
• If the centripetal force is removed from an
  object in circular motion, the object will move
  in what direction?

249
Circular Motion

• What is the symbol for centripetal force?
• Fc
• If the centripetal force is removed from an
  object in circular motion, the object will move
  in what direction?
• Tangent to the circle

250
Circular Motion

• Both centripetal force and centripetal
  acceleration act in which direction?
• Besides centripetal force, what other factor
  keeps an object in circular motion?

251
Circular Motion

• Both centripetal force and centripetal
  acceleration act in which direction?
• Towards the center
• Besides centripetal force, what other factor
  keeps an object in circular motion?
• Inertia

252
Circular Motion

• What is the centripetal acceleration on a
  bicyclist going around a curve (radius20.m) at
  6.7 m/s?

253
Circular Motion

• What is the centripetal acceleration on a
  bicyclist going around a curve (radius20.m) at
  6.7 m/s?
• 2.2 m/s2

254
Circular Motion

• Whats the centripetal force on a 95 kg object
  moving at 5.4 m/s around another object 7.7 m
  away?

255
Circular Motion

• Whats the centripetal force on a 95 kg object
  moving at 5.4 m/s around another object 7.7 m
  away?
• 360 N

256
Electrostatics
257
Electric Charges

• When an atom is neutral (not an __________), the
  number of electrons is_____________ the number of
  protons.
• An atom or material that loses electrons becomes
  __________charged, while an atom or material that
  gains electrons becomes ___________charged. An
  electron or proton carries one ____________
  charge.

258
Electric Charges

• When an atom is neutral (not an __________), the
  number of electrons is_____________ the number of
  protons.
• Ion, Equal to
• An atom or material that loses electrons becomes
  __________charged, while an atom or material that
  gains electrons becomes ___________charged. An
  electron or proton carries one ____________
  charge.
• (), (-), Elementary

259
Electric Charges

• An elementary charge is equal to
  ____________________C
• A coulomb is equal to ____________________elementa
  ry charges

260
Electric Charges

• An elementary charge is equal to
  ____________________C
• 1.6 x 10 -19
• A coulomb is equal to ____________________elementa
  ry charges
• 6.25 x 10 18

261
Electrostatics

• Objects can become charged (gain or lose
  electrons) due to _____________________.
• Two like-charged objects will _____________,
  while oppositely charged objects will
  ___________.
• A charged object and a neutral object will also
  usually ________________.

262
Electrostatics

• Objects can become charged (gain or lose
  electrons) due to _____________________.
• Friction
• Two like-charged objects will _____________,
  while oppositely charged objects will
  ___________.
• Repel, Attract
• A charged object and a neutral object will also
  usually ________________.
• Attract

263
Electrostatics

• When a negatively charged rod is brought near a
  neutral electroscope, what happens and why?
• This is called charging by ____________________

264
Electrostatics

• When a negatively charged rod is brought near a
  neutral electroscope, what happens and why?
• The leaves will repel because they are both
  charged negative due to the electrons being
  repelled by the rod and migrating down the
  electroscope.
• This is called charging by ____________________
• Induction

265
Electrostatics

• An object which is capable of donating or
  accepting a large number of electrons is called
  an electrical _______________________.
• Whats the major example?
• If a negatively charged object is grounded, what
  will happen?

266
Electrostatics

• An object which is capable of donating or
  accepting a large number of electrons is called
  an electrical _______________________.
• Ground
• Whats the major example?
• Earth
• If a negatively charged object is grounded, what
  will happen?
• Electrons will move from the object to the
  ground

267
Electrostatics

• What is the law of conservation of charge?
• If two spheres, one having 5C and the other 9C,
  touch, when moved apart, each sphere will have a
  charge of ____________________.

268
Electrostatics

• What is the law of conservation of charge?
• Total charge of a closed system stays the same
• If two spheres, one having 5C and the other 9C,
  touch, when moved apart, each sphere will have a
  charge of ____________________.
• -2C

269
Electrostatics

• An object that has 1.34 x 10 16 extra electrons
  will have a charge of ________________C

270
Electrostatics

• An object that has 1.34 x 10 16 extra electrons
  will have a charge of ________________C
• 2.14 x 10 -3

271
Electric Force

• As the distance between two charged objects
  triples, the electrostatic force between
  them____________.

272
Electric Force

• As the distance between two charged objects
  triples, the electrostatic force between
  them____________.
• 1/9 of what it was

273
Electric Force

• What is the force between two objects, each
  having a charge of 0.40C, if they are 14m apart?

274
Electric Force

• What is the force between two objects, each
  having a charge of 0.40C, if they are 14m apart?
• 7.3 x 10 6 N

275
Electric Field

• An electric fields direction is described
  according to how it acts on a _________charge.

276
Electric Field

• An electric fields direction is described
  according to how it acts on a _________charge.
• Positive ()

277
Electric Field

• Sketch the electrostatic fields

278
Electric Field

• Sketch the electrostatic fields
• Move away from positive () to infinity

279
Electric Field

• Sketch the electrostatic fields

-

280
Electric Field

• Sketch the electrostatic fields
• Move from positive () to negative (-)

-

281
Electric Field

• What is the field intensity if an object with a
  charge of 0.60 C is acted on by an electric force
  of 3.0 x 10 3 N?

282
Electric Field

• What is the field intensity if an object with a
  charge of 0.60 C is acted on by an electric force
  of 3.0 x 10 3 N?
• 5.0 x 10 3 N/C

283
Electric Potential Energy Electric Potential

• The work needed to move a charged particle from
  one place to another within an electric field is
  known as the ____________
• The work needed to move a unit charged particle
  from one place to another within an electric
  field is known as the ____________, ____________
  or ____________

284
Electric Potential Energy Electric Potential

• The work needed to move a charged particle from
  one place to another within an electric field is
  known as the ____________
• Electric potential energy
• The work needed to move a unit charged particle
  from one place to another within an electric
  field is known as the ____________, ____________
  or ____________
• Electric potential, Potential difference,
  voltage

285
Electric Potential Energy Electric Potential

• The unit of electric potential energy is the
  ________, represented by __________.
• When dealing with charges, the much smaller unit
  _________, represented by ________, and equal to
  _________________ J is used.
• The unit of potential difference is the ________,
  represented by __________.

286
Electric Potential Energy Electric Potential

• The unit of electric potential energy is the
  ________, represented by __________.
• Joules, J
• When dealing with charges, the much smaller unit
  _________, represented by ________, and equal to
  _________________ J is used.
• Electronvolt, eV, 1.6 x 10 -19
• The unit of potential difference is the ________,
  represented by __________.
• Volt, V

287
Electric Current
288
Electric Current

• The unit which describes electric current in
  terms of how much charge passes a given point in
  a conductor is called the _____________, which is
  represented by _______________.
• The meter used to measure this is called an
  ______________, and is always connected in
  ________________.

289
Electric Current

• The unit which describes electric current in
  terms of how much charge passes a given point in
  a conductor is called the _____________, which is
  represented by _______________.
• Ampere, A
• The meter used to measure this is called an
  ______________, and is always connected in
  ________________.
• Ammeter, Series

290
Electric Current

• If 140C of charge passes a spot in a wire in 7.0
  s, how many amperes of current is the wire
  carrying?

291
Electric Current

• If 140C of charge passes a spot in a wire in 7.0
  s, how many amperes of current is the wire
  carrying?
• 20. A

292
Electric Voltage

• In order for current to flow in a wire there must
  be a complete circuit, and a ______________, or
  _______________.
• The meter used to measure this is a
  _____________, which is always connected in
  _________________.

293
Electric Voltage

• In order for current to flow in a wire there must
  be a complete circuit, and a ______________, or
  _______________.
• Potential difference, Voltage
• The meter used to measure this is a
  _____________, which is always connected in
  _________________.
• Voltmeter, Parallel

294
Electric Circuits

• What is the schematic symbol for
• A battery (cell)?
• A voltmeter?
• An ammeter?
• A resistor?
• A switch?

295
Electric Circuits

• What is the schematic symbol for
• A battery (cell)?
• A voltmeter?
• An ammeter?
• A resistor?
• A switch?
• See reference tables

296
Electric Resistance

• Metals and other materials with many free
  electrons are called ______________, because they
  allow current to pass easily. Things that dont
  allow current to pass easily , like glass,
  rubber, and plastic, are called ________________.

297
Electric Resistance

• Metals and other materials with many free
  electrons are called ______________, because they
  allow current to pass easily. Things that dont
  allow current to pass easily , like glass,
  rubber, and plastic, are called ________________.
• Conductors, Insulators

298
Electric Resistance

• The measurement of how easily current flows
  through a conductor is called ________________,
  measured in ____________________, and represented
  by _____________.

299
Electric Resistance

• The measurement of how easily current flows
  through a conductor is called ________________,
  measured in ____________________, and represented
  by _____________.
• Resistance, Ohms, O

300
Ohms Law

• How much current is carried by a conductor that
  has a resistance of 20. O when there is a
  potential difference of 200.V ?

301
Ohms Law

• How much current is carried by a conductor that
  has a resistance of 20. O when there is a
  potential difference of 200.V ?
• 10. A

302
Resistivity

• Generally, resistance decreases when a
  conductors length_________________, diameter
  __________________, and temperature
  ________________. The term used to describe the
  materials inherent conductivity is ____________.

303
Resistivity

• Generally, resistance decreases when a
  conductors length_________________, diameter
  __________________, and temperature
  ________________. The term used to describe the
  materials inherent conductivity is ____________.
• Decreases, Increases, Decreases, Resistivity

304
Resistivity

• What is the resistance of a 3.50 m length of
  aluminum wire that has a diameter of 4.0 x 10-3 m
  and is at 20o C?

305
Resistivity

• What is the resistance of a 3.50 m length of
  aluminum wire that has a diameter of 4.0 x 10-3 m
  and is at 20o C?
• 0.079 O

306
Series Parallel Circuits

• Sketch a series circuit that has two resistors of
  50.O and 70.O and a battery of 12V, along with a
  switch.
• What is the total resistance?
• What is the total current?
• What is the voltage across the 50.O resistor?

307
Series Parallel Circuits

• Sketch a series circuit that has two resistors of
  50.O and 70.O and a battery of 12V, along with a
  switch.
• See reference tables for symbols
• What i