Question

Question 19:
If action is always equal to reaction, explain why a cart pulled by a horse can be moved.

Lakhmir Singh Physics Class 9

Answer 1

Answer:

according to newtons 3 rd low every reaction has equal and pposite reaction . the horse pushes backward on the ground , so the ground pushes forward with an equal force. its tottay the ground which allow a horse to pull a cart. .by newton 3rd low cart must then exert an equal and opposite force on horse .the horse pushes backward anf the ground pushes forward . Thats an action reaction pair horse is doing action and in return the ground is giving reaction resulting in motion of horse an cart .

Answer 2

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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.