Question

explain the old view of friction and it's limitations ​

Answer 1

Answer:

it is the contact between two bodies

Answer 2

Answer:

Friction => friction is a force which oppose the relative motion of any two bodies .

• Friction force is also exist in pair .

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There are two types of Frictional force

➡️ Kinetic force :-

• relative motion occur

• it doesn't depend upon speed

Fk = constant

=> Fk = μkN

μ => coefficient of kinetic friction

➡️ Static friction :-

• when there is a tendency of relative motion (rest)

• Fs = variable = self adjusting

• 0≤Fs≤Flimiting

Flimiting = μsN

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➡️ CASE1

• If FL > applied force (no motion)

Frictional force = applied force

➡️ CASE2

• If FL < applied force (motion start )

Frictional force = μkN

➡️ CASE3

• If FL = applied force (just tend to start motion)

Frictional force = μsN

Key :-

FL = limiting friction

μk = coefficient of kinetic friction

μs = coefficient of static friction

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