In which of the following cases more friction is desirable?

Movement of piston in a cylinder

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Braking of a vehicle

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Skating on a track

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All of the above

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Solution

The correct option is C Braking of a vehicle
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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In which of the following cases more friction is desirable?

The correct option is C Braking of a vehicleFriction 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.

The correct option is C Braking of a vehicle
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.