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Give examples to show that friction is both a friend and a foe.
Advantages of the friction:
(i) If there is no friction we will not be able to walk or run on the ground.
(ii) Matchstick lights due to friction.
Disadvantage of the friction:
(i) The soles of shoes wear out due to the force of friction.
(ii) Friction produces heat in machines. This heat can damage some parts of the machines.
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