Question

when do we speak of sliding friction?

Answer 1

First of all this question is not biology it's physics



This is the answer
We generally speak of sliding force when we want to resist another body.
actually the fictional force which opposes the actual relative sliding motion between two contact surface.
sliding force intend to stop an object from moving.

Answer 2

Here is your answer

We generally speak of sliding friction when we want to resist another body.

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