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Chapter 12: Forces and MotionPowerPoint Presentation

Chapter 12: Forces and Motion

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Chapter 12: Forces and Motion

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Chapter 12: Forces and Motion

Section 12.3

Newton’s Third Law of Motion and Momentum

- States that whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.

- These forces that are produced by the two objects are action and reaction forces.
- Sometimes action and reaction forces result in motion – sometimes they don’t.

- Action and reaction forces do NOT cancel themselves out.

- Product of an object’s mass and its velocity
- An object at rest has a momentum of 0.
- Momentum = Mass x Velocity
- Measured in kilogram-meters/second
- p = mv

- Momentum is conserved in a closed system.
- A closed system of objects means that there are no outside forces or objects acting on the objects in the system.
- In a closed system, the loss of momentum by one object equals the gain of momentum by the second object.