Question

When is friction not helpful?

Answer 1

When the irregular spaces are absent on the ground or any object then friction doesn't works............

Friction is not helpful when we are in air or any other surfaces ...........

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Answer 2

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Friction is sometimes unhelpful.

Friction is sometimes unhelpful.For example, if you don't lubricate your bike regularly with oil, the friction in the chain and axles increases. Your bike will be noisy and difficult to pedal. When there is a lot of friction between moving parts, energy is lost to the surroundings as heat.

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