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**Newton's Third Law of Motion **

Chapter 10 Section 4 Newton's Third Law of Motion

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Newton's third law of motion states that if one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object.

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**Another way to state this law is that for every action there is an equal but opposite reaction.**

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**For example, when you jump, you push on the ground with your feet**

For example, when you jump, you push on the ground with your feet. This is an action force. The ground pushes back on your feet with an equal and opposite force. This is a reaction force. You move upward when you jump because the ground is pushing you.

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**Action-Reaction Pairs **

The pair of action and reaction forces that allow you to jump off the ground is called an action-reaction pair. Action-reaction pairs are all around you.

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**Look at the example in the photo below**

Look at the example in the photo below. When two volleyball players hit a ball from opposite directions, each of their hands exerts a force on the ball. The ball exerts reaction forces on both of the hands.

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If the forces are equal in strength, but opposite in direction, the forces cancel out. The ball does not move either to the left or to the right.

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