Give examples to show how friction can be beneficial. What is the significance of friction in transport?

Without resting friction, humans and animals would not be able to walk. Without friction, objects would slip out of your hands. The frictional force stops the vehicle when braking. In winter, sand is sprinkled on the road and sidewalks to increase friction.

The friction force reduces the efficiency of engines and other mechanisms of a car and railway trains, but without it, movement would be impossible in general.