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(i) Define friction. (ii) Is it a contact force or non-contact force? (iii) Why do we rub our hands in winter?

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(i) Define friction.

(ii) Is it a contact force or non-contact force?

(iii) Why do we rub our hands in winter?

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(i) Friction is the force which comes into play when one object moves on the surface of another.

(ii) It is a contact force.

(iii) When we rub our hands in winter heat is generated due to the force of friction. Therefore, we feel warm.

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