Question

if action is always equal to reaction then a cart pulled by a horse can be move

Answer 1

remember that action and reaction will never act on same body. if action is on ground by horse in the form of friction. then reaction is the friction force acted on the horse by ground. So action acts on ground and reaction acts on horse which makes the horse move

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Answer 2

Question :-

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

Answer :-

The third law of motion states that action is always equal to the reaction but they act on two different bodies.

In this case the horse exerts a force on the ground with its feet while walking, the ground exerts an equal and opposite force on the feet of the horse, which enables the horse to move forward and the cart is pulled by the horse.

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