Question

How can a horse pull a cart of action and reaction is equal?

Answer 1

Answer:

When a horse pulls a cart with a certain force, then the cart pulls the horse with the same force and the system of horse and cart should not move. But, if we analyze the problem carefully, then horse not only applies force on the cart, but also pushes it in the forward direction. The force applied by the horse on the Earth is insufficient to move the Earth, but force applied by the Earth is sufficient to make the horse move in the forward direction.

This unbalanced force applied by the Earth makes the system of horse and cart move in the forward direction.

Explanation:

I hope my answer will help you.

Answer 2

$\bigstar\green{\underline{\sf{\purple{Answer}}}}\bigstar$

When the horse walks in the forward direction (with the cart attached to it), it exerts a force in the backward direction on the Earth. An equal force in the opposite direction (forward direction) is applied on the horse by the Earth. This force moves the horse and the cart forward.

The velocity at which the horse can move by applying a force on the earth depends on the mass of the horse (and the cart attached to it). The heavier the cart, the slower the motion of the horse (for a given amount of force applied by the horse on the Earth). If the cart is too heavy, the force exerted by the horse on the Earth will be insufficient to even overcome the force of inertia. In this case, the horse will not be able to pull the cart.