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Question

Ball bearings reduce friction because they ----- rather than slide.

A
roll
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B
swing
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C
bounce
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D
None of the above
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Solution

The correct option is A roll
Ball bearing reduce friction because they roll rather than slide. Because the balls are rolling they have a much lower coefficient of friction than if two flat surfaces were sliding against each other. Ball bearings tend to have lower load capacity for their size than other kinds of rolling-element bearings due to the smaller contact area between the balls and races.

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