Newtons Laws

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Newtons Laws
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• For next time
• Read Chapter 4, Sections 1 - 4
• Homework Chapter 4 Questions 2, 4, 5

2
Pretest 3(the crate in the snow)
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3
Pretest 3(the crate in the snow)
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4
Pretest 3(the crate in the snow)
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?
5
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Forces(dynamics)
D
Motion(kinematics)
6
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Types of Forces
Noncontact Forces
Contact Forces
Pushes
Pulls
Electromagnetic
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Types of Forces
Noncontact Forces
Contact Forces
Gravitational
Pushes
Pulls
Electromagnetic
8
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Types of Forces
Noncontact Forces
Contact Forces
Gravitational
Pushes
Pulls
Electromagnetic
9
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Types of Forces
Noncontact Forces
Contact Forces
Gravitational
Pushes
Pulls
Electromagnetic
Electric
Magnetic
10
0
Types of Forces
Noncontact Forces
Contact Forces
Gravitational
Pushes
Pulls
Electromagnetic
Electric
Magnetic
11
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Types of Forces
Noncontact Forces
Contact Forces
Gravitational
Nuclear
Pushes
Pulls
Electromagnetic
Electric
Magnetic
12
0
Types of Forces
Noncontact Forces
Contact Forces
Gravitational
Nuclear
Pushes
Pulls
Electromagnetic
Tension
Electric
Magnetic
13
0
Types of Forces
Noncontact Forces
Contact Forces
Gravitational
Nuclear
Pushes
Pulls
Electromagnetic
Tension
Electric
Magnetic
14
0
Types of Forces
Noncontact Forces
Contact Forces
Gravitational
Nuclear
Pushes
Pulls
Electromagnetic
Tension
Electric
Magnetic
Normal
15
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Types of Forces
Noncontact Forces
Contact Forces
Gravitational
Nuclear
Pushes
Pulls
Electromagnetic
Tension
Electric
Magnetic
Normal
16
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Types of Forces
Noncontact Forces
Contact Forces
Gravitational
Nuclear
Pushes
Pulls
Electromagnetic
Tension
Electric
Magnetic
Normal
perpendicular to surface
17
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Types of Forces
Noncontact Forces
Contact Forces
Gravitational
Nuclear
Pushes
Pulls
Electromagnetic
Tension
Electric
Magnetic
Friction
Normal
perpendicular to surface
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Types of Forces
Noncontact Forces
Contact Forces
Gravitational
Nuclear
Pushes
Pulls
Electromagnetic
Tension
Electric
Magnetic
Friction
Normal
perpendicular to surface
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Aristotle384 - 322 B.C.
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20
What is the velocity of this room?
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400 m/s
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Galileo Galilei (1564-1642)
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Ball on Ramp
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23
Ball on Ramp
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24
Ball on Ramp
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25
Ball on Ramp
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Ball on Ramp
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• An object at rest stays at rest and an object in
  motion stays in motion at constant speed in a
  straight line, unless acted upon by a net force.

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Sir Isaac Newton (1642-1727)
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Newtons 1st Law
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• No net force - no acceleration
• No acceleration constant velocity
• An object at rest stays at rest and an object in
  motion stays in motion at constant speed in a
  straight line, unless acted upon by a net force.

29
Newtons 2nd Law
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• Deals with the effect of forces on an object.

30
Dry Ice on Slate
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Motion of the Block
Velocity
Acceleration
Push or Pull Necessary to Maintain Motion
at rest
uniform motion to the right
0
0
moves to the right and speeds up without changing
direction
moves to the right, slows down and stops without
changing direction
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Dry Ice on Slate
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Motion of the Block
Velocity
Acceleration
Push or Pull Necessary to Maintain Motion
0
0
0
at rest
uniform motion to the right
0
0
moves to the right and speeds up without changing
direction
moves to the right, slows down and stops without
changing direction
32
Newtons 2nd Law
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• Net force causes acceleration (not velocity)
• The net force is the vector sum of all the
  individual forces on an object.

Acceleration is in same direction as the net
force.
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Which one is the net force?
Types of Forces
Noncontact Forces
Contact Forces
Gravitational
Nuclear
Pushes
Pulls
Electromagnetic
Tension
Electric
Magnetic
Friction
Normal
34
Pretest 3(the crate in the snow)
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?
35
Pretest 3(the crate in the snow)
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