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.

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Chapter 12: Forces and Motion

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Chapter 12 forces and motion

Chapter 12: Forces and Motion

Section 12.3

Newton’s Third Law of Motion and Momentum


Newton s third law of motion

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

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

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

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.


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