Question

1. Fill in the blanks.
a. Friction ......
the motion of an object.
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Answer 1

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.

1. Fill in the blanks.

a. Friction is the motion of an object.