Give examples to show that friction is both a friend and a foe.

Explanation

Examples to show that friction is a friend and a foe
Friction is Friends: (i) Friction allows us to grip and catch different objects.
(ii) It helps us to walk comfortably on the surface.
(iii) It helps to minimise the speed or to stop the moving objects.
(iv) It helps us to write on paper or blackboard.
(v) The things do not move from their place due to the friction between the surfaces.
Friction is a Foe
(i) Friction causes wear and tear in objects.
(ii) It causes damage to the parts of machines
(iii) The machines or tools require regular maintenance due to which a lot of money is wasted.
(iv) It reduces the speed of moving objects, so more force is required.
(v) It does not allow the free movemetn of objects.