Question

which law works when horse pulls a cart

Answer 1

Newton's third law states that to every action, there is always an equal (in magnitude) and opposite (in direction) reaction.

In case of horse cart, The horse pushes the ground with it's foot in the backward direction by pressing the ground. As a result of this force of action ( i.e. backward push ), the ground pushes the horse in forward direction

According to Newton's third law of motion , The Ground pushes the horse in forward direction. Thus, the horse moves in a forward direction . As the cart is attached to the horse , the cart too moves in the forward direction.

Hence, The horse pulls the cart .

Answer 2

Newton's Third Law Of Motion.

Reason:- While pulling the cart, the horse pushes the ground with its foot, as a reaction, the ground exerts a force on the horse equal and opposite to the force applied by it making the cart move in the forward direction.

Hope this will help you :)