What type of friction is involved when an axle rotates in a sleeve? Justify.

Dear student

When an axle rotates in a sleeve the type of friction involved is "sliding friction". This is caused by the non-infinitesimal separation between axle and sleeve. Obviously the sleeve can not squeeze the axle, it must be free to rotate. So there is some space between axle and sleeve which causes the axle and sleeve to wobble a bit. This wobbling causes large energy loses so behave like a type of effective friction force on the axle.

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the friction involved in that case is sliding friction
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Sliding friction
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What does sleeve mean in it??
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