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Answer:
Friction is the force that opposes motion between any surfaces that are in contact. There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Fluid friction occurs in liquids and gases.
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.
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