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    Newtons third law and some puzzling questions

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    Have a couple of puzzling questions having trouble answering.

    1. Since the force that acts on a bullet when a gun is fired is equaland opposite to the force that cats on the gun, does this imply a zero net force and therefore the impossibility of an accelerating bullet? Explain

    2. When you jump upward the earth recoils back downward. Why cant this motion of the world be noticed?

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    Solution Preview

    1. Let me state the Newton's third law of motion

    "To every action there is always an equal and opposite reaction; or, the mutual actions of two bodies upon each other are always equal, and directed to contrary parts."

    In other words, if body X exerts a force on body Y, body Y exerts an equal but oppositely directed force on body X; and furthermore the forces lie along the line joining the bodies.
    Notice that the action and reaction forces, which always occur in pairs, act on different bodies. If they were to act on ...

    Solution Summary

    This solution provides a detailed explanation of the three given physics questions including an explanation of velocity and momentum.