Question

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Answer 1

Answer:

1.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.

2.A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races.

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Answer 2

Explanation:

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