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Question

Choose the incorrect statement from statements given below:

A
Friction is an electromagnetic force.
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B
Value of static friction is always greater than kinetic friction.
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C
Coefficient of static friction is greater than coefficient of kinetic friction.
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D
None of these
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Solution

The correct option is B Value of static friction is always greater than kinetic friction.
Friction is a parallel component of contact force that results due to the forces acting between the charged components (i.e electron, proton) of atoms of the two bodies/surfaces in contact.
Friction is an electromagnetic force.

The relation between coefficient of static and kinetic friction is μsμk
But value of static friction is not always greater than kinetic friction. Static friction fs adjusts its value in the range (0 fsμsN) to prevent the relative motion between surfaces in contact.
Once slipping happens then kinetic friction (fk=μkN) acts on body, which is constant.
Option (b) is the incorrect option.

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