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Question

Of the following statements choose the correct combination that helps reduce friction:
A) Grease is used to reduce friction in bicycle chain
B) Ball bearings are used to reduced friction in a fan
C) Oil can be used to increase friction in a car engine
D) Talc can be used to reduce friction when an object is sliding on a surface.


A

A, B, D

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B

A, C, D

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C

B, C, D

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D

A, B, C

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Solution

The correct option is A

A, B, D


Oil is used as a lubricant in order to reduce the roughness of surfaces in contact. Since option C negates this property, it is incorrect.
From the rest of the statements, A and D are lubricants, which is used to make the surface slippery. And ball bearings reduce friction by rolling as rolling friction has a very less coefficinet of friction than sliding friction. So, as stated in the statements, they reduce friction.
So, correct combination : A,B,D.


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