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Forces and Pressure. — Science STD 8 — Question

Tamilnadu BoardEnglish MediumSTD 8ScienceForces and Pressure.2 Marks
Question
Why is a ball bearing used in a cycle hub?
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Answer

The rolling friction is smaller than sliding friction, sliding is replaced by rolling with the usage of ball bearings. So lead shots are used in the bearing of a cycle hub.

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