For every action there is an equal and opposite reaction then how a horse is able to pul a cart
Answers
Um, so I guess your doubt is whether the cart should pull the horse back with an equal force and the two forces should cancel each other out. Right?
Newton's third law is often misunderstood by people in this way. It states that forces come in pairs. There is an equal and opposite force for every force acting on a body. Now the second force does NOT act on the same body. This is the first thing you must remember.
The horse applies force on the cart and the cart applies force on the horse. These two forces act on different bodies and cannot cancel each other out. They would cancel each other if they acted on the same body.
And yes, the cart too, is pulling the horse back. But the horse does not move back because of the ground. The horse exerts some force on the ground and the ground too, exerts equal and opposite force on the feet of the horse, preventing the horse from going back.
I hope your doubt was clarified.
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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