07. In which of the following cases more friction is desirable
(a) Movement of piston in a cylinder
(c) Running on a track
(b) Breaking of a vehicle
(d) All of the above
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Friction is desirable in braking of a vehicle. As brakes are applied, friction between brake shoes and tyres opposes rotation of tyres and hence, forces it to stop.
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(d) All of the above is the answer
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