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What is limiting friction?

Menka Malguri , 14 Years ago

Grade 12th Pass

5 Answers

Chetan Mandayam Nayakar

The amount of Friction that can be exerted between two surfaces is limited and if the forces acting on the body are made sufficiently great, motion will occur. Hence, we define limiting friction as the friction which is exerted when equilibrium is on the point of being broken by one body sliding on another. The magnitude of limiting friction is given by the following three laws.

Law 1
The ratio of the limiting friction to the Normal reaction between two surfaces depends on the substances of which the surfaces are composed and not on the magnitude of the Normal reaction.

This ratio is usually denoted by $\mu$ .
Thus if the Normal reaction is R, the limiting friction is $\mu\:R$
For given materials polished to the same standard $\mu$ is found to be constant and independent of R.
$\mu$ is called The Coefficient of friction

Law 2
The amount of limiting friction is independent of the area of contact between the two surfaces and of the shape of the surfaces, provided that the Normal reaction is unaltered.

Law 3
When motion takes place the direction of friction is opposite to the direction of relative motion and independent of velocity. The magnitude of the force of friction is in a constant ratio to the Normal reaction but this ratio may be slightly less than when the body is just on the point of moving.

Last Activity: 14 Years ago

bhanuveer danduboyina

The maximum friction that can be generated between two static surfaces in contact with each other. Once a force applied to the two surfaces exceeds the limiting friction, motion will occur. For two dry surfaces, the limiting friction is a product of the normal reaction force and the coefficient of limiting friction.

Last Activity: 14 Years ago

Ahmad Ali

if two bodies of masses m1 and m2are hanging from the two ends of a string which is passing ovr a pulley find the values of tention and acclration in it.

Last Activity: 10 Years ago

W

Limiting friction is that friction which is the point of difference between the kinrtic and static friction

Last Activity: 8 Years ago

R K SINGH

A maximum amount of opposing force between two contacts , after then one body starts to move with respect to other on applying a external force is called limiting force of friction of reference body.

Last Activity: 8 Years ago