Question

A horse,pulling a cart has to apply a greater force to start the cart then to keep the cart in motion.why ?

Answer 1

when he is starting the cart he has to overcome the static friction which opposes the motion of the cart.
but when he is pulling the moving cart he has to overcome dynamic/kinetic friction.
since static friction is more than dynamic/kinetic friction, he has to pull harder during the start.

Answer 2

Answer:

To start the cart inertia of rest (of the cart) has to be overcome Further force required to be applied has to be greater than the force of limiting friction Once the motion starts force of kinetic friction has to be overcome , which is less than the force of limitting friction Hence smaller force is enough to keep the cart in motion

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