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Classical Mechanics

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Pushing a Chair Across the Floor

CLMECH-CZYPSR

You shove a chair with wheels (and let it go) and it starts moving across the floor. However, the chair soon slows down and comes to a complete stop. To keep the chair moving, you need to keep pushing on it. This simple experiment implies that

A

Newton's first law, or the law of inertia, does not apply to a chair moving horizontally.

B

the action-reaction forces act on the chair and cancel each other.

C

a net force in the direction opposite to the motion of the chair acts to slow it down.

D

the weight of the chair slows it down.