Question

A truck that is stopped on the road has to be pushed hard to get into motion.When the truck is moving a little, it can be moved faster with a smaller/less push.Why?​

Answer 1

Answer:

kinetic energy

Explanation:

Answer 2

It is easier to move a truck that is already in motion even using lesser force/push because kinetic friction is easier to come over than static friction.

• When we try to move the truck, we need to provide velocity to produce a force that will work against static friction.
• But when the truck moves a little bit or we can say when it comes in motion we then are working against kinetic friction and have to provide it with a force to come over that.  
• We know it for a fact that the coefficient of static friction is greater compared to that of kinetic friction.

And hence, it is easier to move the truck once it is already in motion.