Question

if action is always equal to reaction then.How a horse can put a cart?

Answer 1

An horse can pull the cart as when the horse pushes the ground with his leg the cart experiences an unbalanced force.
We know that this action and reaction force acts on two different objects.
When the horse pulls the cart he applies force against the frictional force between the wheels of Cart and Earth surface and since the horse has energy due to the cellular respiration he is able to apply an unbalanced force which results in the movement of the cart.

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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