Question

State the laws of limiting friction. Hence define coefficient of friction.​

Answer 1

AnSwer :-

The laws of limiting friction are as follows:

$\bigstar$The value of limiting friction depends on the nature of the two surfaces in contact and on the state of their smoothness.

$\bigstar$ The force of friction acts tangential to the surfaces in contact in a direction opposite to the direction of relative motion.

$\bigstar$The value of limiting friction is directly proportional to the normal reaction between the two given surface

$\bigstar$ For any two given surfaces and for a given value of normal reaction the force of limiting friction is independent of the shape and surface area of surfaces in contact.

Coefficient of Friction :-

Coefficient of limiting friction for two given surfaces in contact is defined as the ratio of the force of limiting fnction between them and the force of normal reaction N.

μ$\sf _r$ = $\sf \dfrac{f_1}{N}$

Answer 2

Answer:

The force of limiting friction between two surfaces in contact is independent of the area of contact. (iii) Limiting friction is directly proportional to the magnitude of normal reaction N between two surfaces in contact, i.e. where n is constant of proportionality and known as coefficient of friction.

Explanation:

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