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?
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Because of kinetic friction.
Kinetic friction is defined as a force that acts between moving surfaces. A body moving on the surface experiences a force in the opposite direction of its movement. The magnitude of the force will depend on the coefficient of kinetic friction between the two material. So if the truck starts moving/gets into motion, kinetic friction is formed. If the truck stops, friction that forms is called static friction.
(I hope this helps you)
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