Question

Describe kinetic friction and it's laws !!

Answer 1

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Answer 2

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Force that resists motion of one body over another with which it is in contact.

▫It is Denoted by fk

▪As motion starts, fs vanishes and fk appears

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Kinetic friction is Independent of the area of contact and velocity of the body

It varies with Normal reaction, N

fk ∝ N

fk = constant * N

fk = μk N;

μk is the coefficient of kinetic friction

Three scenarios can arise in a body’s motion

When applied force > fk

Fa > fk

(Fa – fk) = ma

a = (Fa – fk)/m

When applied force = fk

Fa = fk

Therefore, a = 0 i.e. the body moves with uniform velocity

When applied force = 0

Fa = 0

A = -fk/m

No motion occurs, the body stops

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