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Laws of Motion
Friction is necessary because it is helpful to us in many ways. For example,
(i) Without friction we cannot write.
(ii) Speed of vehicles can be controlled only due to friction.
(iii) We cannot rotate the pulley without friction between belt and pulley.
(iv) It is impossible to climb up with rope without friction between hand and rope. Frictional force helps the person to move forward.
(v) Without friction we even cannot walk.
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