Question 1 Page 126 - Chapter 9 Class 9 - Force and Laws Of Motion

If action is always equal to the reaction, explain how a horse can pull a cart

Answer

Action is always equal to the reaction but it acts on two different bodies.

So, if a horse pulls a cart with some force.

Same force is applied on the ground.

Since the force is on two different objects, it cannot cancel

For a horse to move a cart, it applies muscular force on the cart so that it overcomes the frictional force on the wheels. When this muscular force is greater than frictional force, the horse cart moves.