# Chapter 12: Forces and Motion - PowerPoint PPT Presentation

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Chapter 12: Forces and Motion. Section 12.3 Newton’s Third Law of Motion and Momentum. Newton’s Third Law of Motion. 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. Action and Reaction Forces.

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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

### Newton’s Third Law of Motion

• 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.

### Action and Reaction Forces

• 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.

### Momentum

• 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

### Conservation of Momentum

• 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.