Why are ball bearings used in machines?

Sliding friction replaces rolling friction.

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Static friction replaces rolling friction.

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Rolling friction replaces sliding friction.

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Rolling friction replaces static friction.

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Solution

The correct option is C
Rolling friction replaces sliding friction.

The amount of work done in moving the parts of the machine is reduced by the use of ball bearings. Rolling friction is the resistance to motion experienced by a body when it rolls upon another. It is much less than sliding friction for the same pair of bodies. When one body rolls upon another, there is theoretically no sliding or slip between them.

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Similar questions

Since rolling friction is less than sliding friction, sliding friction is replaced with rolling friction in most machines using ball bearings.

Ball bearing is a device which usually converts:
(a) rolling friction into sliding friction
(b) static friction into sliding friction
(c) sliding friction into rolling friction
(d) rolling friction into static friction

Which of the following statements is incorrect?
(a) static friction is greater than rolling friction
(b) sliding friction is less than rolling friction
(c) rolling friction is less than static friction
(d) static friction is greater than sliding friction

Q. Ball bearings use rolling friction instead of sliding friction.

Q. Assertion :In order to reduce sliding friction, lubricants are used. Reason: Lubrication changes the conditions of rubbing, replacing the sliding friction by rolling friction, there by reducing the force of friction.

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