Question

what....is. friction....
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Answer 1

Explanation:

Friction is a force between two surfaces that are sliding, or trying to slide, across each other. For example, when you try to push a book along the floor, friction makes this difficult. Friction always works in the direction opposite to the direction in which the object is moving, or trying to move.

Answer 2

Answer:

Friction is the resistance to motion of one object moving relative to another.

Explanation:

it is the result of the electromagnetic attraction between charged particles in two touching surfaces