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Physics · Laws of Motion3 / 12
MEDIUMNewton's Third Law

A horse pulls a cart. By Newton's third law, the cart pulls the horse with an equal force. Why does the system still move forward?

AThe horse exerts a greater force than the cart
The net external force on the system is non-zero due to ground friction
CAction and reaction act on different bodies, cancelling out
DThe cart has less mass than the horse

Explanation

Action-reaction pairs act on different objects. The ground pushes the horse forward (friction); this external force is what moves the system.

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