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Friction — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsFriction1 Mark
Question
Assertion : Friction is a self adjusting force.
Reason : Friction does not depend upon mass of the body.
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Answer

(d) Only static friction is a self adjusting force. This is because force of static friction is equal and opposite to applied force (so long as actual motion does not start). Frictional force $=\mu mg$ i.e. friction depends on mass.

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