Question

What is friction ? How friction is considered both as toe and friend?​

Answer 1

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Friction, force that resists the sliding or rolling of one solid object over another. Frictional forces, such as the traction needed to walk without slipping, may be beneficial, but they also present a great measure of opposition to motion.

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.

 Friction is foe: (i) Friction causes wear and tear in objects.

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