Motion

1
Chapter 2 Motion
2
Problem Format

• Example If you travel 30 km in 15 min, what is
  your speed?
• List what is known and what you are looking for
• Select the formula you need to solve the problem
• 3. Show setup work
• 4. Show answer (include magnitude and units) and
  circle or box in answer

d30 km t .25 hr v ?
vd/t
v30km/.25hr
120 km/hr
3
(No Transcript)
4
Percentage Error Percentage Error Absolute
Error x 100 Accepted value Absolute
Error Observed value accepted value
Experimental 9.92 Accepted 9.81
(9.92 9.81)/ 9.81 x 100
1
5
Rate anything compared to time
Rate Quantity time
Motionall motion is relative. (its compared to
something else)
6
Distance

• A scalar quantity
• How far moved or traveled
• Linear amount covered

7
Displacement

• a vector quantity
• The magnitude and direction of a change in
  position
• How far and in what direction traveled from
  starting point

B
A
Displacement x xf - xi
Can be positive or negative
8
Speed rate at which distance is covered
Speed distance time
Scalar Quantity
9
Velocity

• rate at which displacement occurs
• Speed in a given direction- if in a straight line

V x or v xf xi
t tf - ti
Vector Quantity
10
Velocity/ Graphing

1. If the line on a displacement v. time graph is a
   straight line, this shows uniform velocity
2. The slope of a displacement/time graph is
   velocity
3. Average velocity total displacement/time
   interval
4. Average velocity the slope of a straight line
   joining 2 points on a displacement/time graph
5. Instantaneous Velocity the slope of a tangent
   to a displacement/time graph

Velocity v. Time Graphs
Distance (m)
Distance(m)
Time (sec)
Time (sec)
11
Acceleration change in velocity/ time a
v/ t a vf vi t Acceleration
can be positive negative (deceleration) Accerat
ion due to gravity 9.81 m/s2
12

• Terminal Velocity
• occurs when an object is falling through a
  material which provides resistance
• The maximum speed reached
• When the force of gravity force of resistance
• There is no furture acceleration

13

• g
• acceleration due to gravity
• Can be put in formula in place of a
• -9.81 m/s2
• Up down -
• Free Fall
• An object falling in a vacuum in the absences of
  air resistance. No terminal velocity

14
Graphs Velocity slope of displacement/time
graph Acceleration slope of a velocity/time
graph Displacement area beneath the slope of a
velocity/time graph