what is friction ?
what is ball bearing?
what is natural resources?
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ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. ... Because the balls are rolling they have a much lower coefficient of friction than if two flat surfaces were sliding against each other.
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Answer:
1.
The rubbing one surface or thing against another.
2.
One of a number of metal balls put between parts of a machine to make them move smoothly.
3.
Material or substancea occurring in nature which can be exploited for economic again.
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