Question

If action is always equal to the reaction, explain how a horse can pull a cart.
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Answer 1

☆$\red {HELLO\:DEAR}$☆

A horse pushes the ground in the backward direction.

According to Newton’s third law of motion, a reaction force is exerted by the Earth on the horse in the forward direction.

As a result, the cart moves forward.

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☆$\blue {FOLLOW\:ME}$☆

Answer 2

Every action has an equal and opposite reaction, but it is not always on the same surface.

The second part of the third law of Newton is commonly missed out.

When a horse pulls a cart, it pushes of the ground and the cart.

The ground pushes the horse in the opposite direction, so the horse moves.

The cart, on the other hand, gives a lower amount of pull, therefore, there is movement.

Hope it helps!