Question

what is force of friction in very short answer​

Answer 1

The friction force is the force exerted by a surface as an object moves across it or makes an effort to move across it. There are at least two types of friction force - sliding and static friction. Though it is not always the case, the friction force often opposes the motion of an object.

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Answer 2

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$\implies$Frictional force refers to the force generated by two surfaces that contacts and slide against each other. ... These forces are mainly affected by the surface texture and amount of force impelling them together. The angle and position of the object affect the amount of frictional force.