Question

Why frictional force is a contact force​

Answer 1

Answer:

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The frictional force is another type of contact force because it acts between a pair of a surface in contact and tends to oppose the motion of one surface over the other.

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Answer 2

Answer:

A force which can be exerted by an object on another object through only physical contact is known as contact force.

Explanation:

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. For example, if a book slides across the surface of a desk, then the desk exerts a friction force in the opposite direction of its motion. Friction results from the two surfaces being pressed together closely, causing intermolecular attractive forces between molecules of different surfaces.