A particle is moving on rough horizontal ground with an initial velocity $v_{0}$ . If ${\frac{3}{4}}^{t h}$ of its kinetic energy is lost due to friction in time $t_{0}$ , then the coefficient of friction between the particle and the ground is

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Important Questions on Friction

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Beta Question Bank for Medical: Physics>Chapter 6 - Friction>Exercise (Analytical Questions)>Q 3

A ladder rests against a frictionless vertical wall, with its upper end

6 m

above the ground and lower end

4 m

away from the wall. The weight of ladder is

500 N

and centre of
gravity

= (\frac{1}{3}) r d

distance from the lower end. Wall's reaction will be, in

N

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Beta Question Bank for Medical: Physics>Chapter 6 - Friction>Exercise (Assertion & Reason)>Q 1

Two blocks of masses $M_{1} = 4 kg$ and $M_{2} = 6 kg$ are connected by a string of negligible mass passing over a frictionless pulley as shown in the figure below. The coefficient of friction between block $M_{1}$ and the horizontal surface is $0.4$ . When the system is released, the masses $M_{1}$ and $M_{2}$ start accelerating. What additional mass $m$ should be placed over $M_{1}$ , so that the masses $(M_{1} + m)$ slide with a uniform speed?

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Beta Question Bank for Medical: Physics>Chapter 6 - Friction>Exercise (Assertion & Reason)>Q 4

Assertion: Angle of repose is equal to angle of friction.
Reason: When the body is just at the point of motion, the force of friction in this stage is called as limiting friction.

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Beta Question Bank for Medical: Physics>Chapter 6 - Friction>Exercise (Assertion & Reason)>Q 17

Assertion: A car moving on a horizontal road may be thrown out of the road in taking a turn due to lack of proper centripetal force.

Reason: If a particle moves in a circle, describing equal angles in equal intervals of time. Then the velocity vector changes its magnitude.