4.2 friction - Rajasthan Board (RBSE) STD 11 Science Physics Questions

Q 1M.C.Q (1 Marks)1 Mark

A football player is moving southward and suddenly turns eastward with the same speed to avoid an opponent. The force that acts on the player while turning is :

A
along south-west
B
along eastward
C
along northward
✓
along north-east

Answer: D.

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Q 2M.C.Q (1 Marks)1 Mark

Calculate the maximum acceleration (in $m s ^{-2}$) of a moving car so that a body lying on the floor of the car remains stationary. The coefficient of static friction between the body and the floor is $0.15$ $\left( g =10 m s ^{-2}\right)$.

A
$50$
B
$1.2$
C
$150$
✓
$1.5$

Answer: D.

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Q 3M.C.Q (1 Marks)1 Mark

Calculate the acceleration (In $m/s^{2}$) of the block and trolly system shown in the figure. The coefficient of kinetic friction between the trolly and the surface is $0.05 .\left( g =10\; m / s ^{2},\right.$ mass of the string is negligible and no other friction exists).

A
$1$
✓
$1.25$
C
$1.5$
D
$1.66$

Answer: B.

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Q 4M.C.Q (1 Marks)1 Mark

A body of mass $\mathrm{m}$ is kept on a rough horizontal surface (coefficient of friction $=\mu$ ) A horizontal force is applied on the body, but it does not move. The resultant of normal reaction and the frictional force acting on the object is given by $\mathrm{F},$ where $\mathrm{F}$ is

A
$|\overrightarrow{\mathrm{F}}|=\mathrm{mg}+\mu \mathrm{mg}$
B
$|\overrightarrow{\mathrm{F}}|=\mu \mathrm{mg}$
✓
$|\overrightarrow{\mathrm{F}}| \leq \mathrm{mg} \sqrt{1+\mu^{2}} $
D
$|\overrightarrow{\mathrm{F}}|=\mathrm{mg}$

Answer: C.

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Q 5M.C.Q (1 Marks)1 Mark

A block of mass $10\; \mathrm{kg}$ is in contact against the inner wall of a hollow cylindow cylindrical drum of radius $1 \;\mathrm{m}$. The coeffident of friction between the block and the inner wall of the cylinder is $0.1$. The minimum angular velocity needed for the cylinder to keep the block stationary when the cylinder is vertical and rotating about its axis, will be: ......$rad/s$ $\left(g-10 m / s^{2}\right)$

A
$\sqrt{10}$
B
$\frac{10}{2 \pi}$
✓
$10$
D
$10 \pi $

Answer: C.

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4.2 friction Physics - 4.2 friction

4.2 friction question types

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