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Q.

If oil is applied to the door hinges, the friction will__


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a

Decrease

b

Increase

c

Disappear altogether

d

Will remain unchanged 

answer is A.

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Detailed Solution

When oil is applied to the door hinges, the friction decreases.
Friction is the force that opposes a body's motion. It acts between the body's surface of touch and the surface on which it is moving. To produce a motion, the force used to start it must be larger than the frictional force. Friction force depends on the roughness of the surfaces. If oil is applied between the rough surfaces, it creates a thin, smooth film in between the surfaces, thereby reducing the force of friction.
 
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