Write advantages and disadvantages of friction.

Some points are given below which show that friction is both a friend and a foe:

(a) Friction as friend:

• It allows us to grip and catch any object.
• It helps us to walk comfortably on the floor.
• It helps to minimise the speed or to stop any moving object.
• It helps us to write.

(b) Friction as foe:

• It causes wear and tear in objects.
• It causes damage to the parts of machines and tools which further require money to get them repaired.
• It reduces the speed of moving objects, so more force is required.

· It produces hurdles in moving any object freely.