Give three examples of force exerted by tension.

Write one word or few words for the following.

(a) This contact force comes into play when two bodies collide

(b) This force attracts iron and nickel towards the magnet

(c) Friction is reduced on this surface

(d) This type of friction exists when the two bodies are at rest

(e) This type of friction is more than rolling friction

Write three advantages of friction.

Why do we need to increase friction?