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Coefficients of Friction

For any given...

Question

For any given pair of surfaces, the coefficient of friction is maximum in case of limiting friction.

A

False

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B

True

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Solution

The correct option is B True

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Q. The coefficient of limiting friction between the surfaces of contact is the ratio of the ....................... friction to the normal reaction.

Q. The coefficient of limiting friction between the surfaces of contact is the ratio of the friction to the normal reaction.

Q. Mark the correct statements about the friction between two bodies.
(a) Static friction is always greater than the kinetic friction.
(b) Coefficient of static friction is always greater than the coefficient of kinetic friction.
(c) Limiting friction is always greater than the kinetic friction.
(d) Limiting friction is never less than static friction.

μ_{s}, μ_{k}

μ_{R}

are the coefficients of limiting, kinetic and rolling frictions between two given surfaces. Arrange them in ascending order:

Q. In the figure shown, what force

‘ F^{'}

should be applied perpendicular to the plane on the block for it to not move. Given that the coefficient of static friction between the plane and the block is

0.5

.
(Assume limiting case of friction and take

g = 10 {m/s}^{2}

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