Question

give examples to show that friction is both a friend and foe?

Answer 1

examples to show that friction is a friend and a foe: Friction is friend: (i) Friction allows us to grip and catch different objects. (ii) It helps us to walk comfortably on the surface. (iii) It helps to minimize 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 places if we do not want to move, due to friction.   Friction is foe: (i) Friction causes wear and tear in objects. (ii) It causes damage to the parts of machines. (iii) The machines or tools 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 movement of objects.  

Answer 2

Our shoes worn out due to friction.
Machinery parts get overheated.
Many forest fires arise due to friction.

We are able to walk, write due to friction.
Vehicles stop due to friction.