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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 μs≥μk But value of static friction is not always greater than kinetic friction. Static friction fs adjusts its value in the range (0≤ fs≤μsN) 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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