Question

what is frictional force? define it​

Answer 1

Answer:

Explanation:

Friction is the force that resists motion when the surface of one object comes in contact with the surface of another. The mechanical advantage of a machine is reduced by friction, or in other words, the ratio of output to input is reduced because of friction.

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 surface.

Answer 2

Answer:

Those Force Which always Opposes The Motion Of one body over another body Known as Frictional Force.