A block of mass m slides along a floor while a force of magnitude F is applied to it at an angle θ as shown in figure. The coefficient of kinetic friction is μ K . Then, the block's acceleration a is given by : ( g is acceleration due to gravity)

F m cos θ - μ K g - F m sin θ

- F m cos θ - μ K g - F m sin θ

F m cos θ - μ K g + F m sin θ

F m cos θ + μ K g - F m sin θ

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IMPORTANT

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A block rests on a rough inclined plane making an angle of $30 °$ with the horizontal. The coefficient of static friction between the block and the plane is $0.8$ If the frictional force on the block is $10 N,$ the mass of the block is $(g = 10 {ms}^{- 2})$

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Important Questions on Friction

EASY

KCET (UG)

IMPORTANT

Physics Crash Course KCET (UG)>Chapter 6 - Friction>Exercise 1>Q 36

A block is at rest on an inclined plane making an angle

α

with the horizontal. As the angle

α

of the inclination is increased, the block just starts slipping when the angle of inclination becomes

θ

. Then the coefficient of static friction between the block and the surface of the inclined plane is

EASY

KCET (UG)

IMPORTANT

Physics Crash Course KCET (UG)>Chapter 6 - Friction>Exercise 1>Q 37

A wooden block of mass

8 kg

slides down an inclined plane of inclination

30 °

to the horizontal with constant acceleration

0.4 m s^{- 2}

. The force of friction between the block and inclined plane is

(g = 10 m s^{- 2})

EASY

KCET (UG)

IMPORTANT

Physics Crash Course KCET (UG)>Chapter 6 - Friction>Exercise 1>Q 38

A wooden box lying at rest on an inclined surface of a wet wood is held at static equilibrium by a constant force

\vec{F}

applied perpendicular to the incline. If the mass of the box is

1 kg,

the angle of inclination is

30 °

and the coefficient of static friction between the box and the inclined plane is

0.2

the minimum magnitude of

\vec{F}

is (Use

g =

g = 10 m s^{- 2}

)

EASY

KCET (UG)

IMPORTANT

Physics Crash Course KCET (UG)>Chapter 6 - Friction>Exercise 1>Q 39

A block is released from rest on a

45 °

smooth incline and slide a distance

d

. The time taken to slide the same distance is

n

times as much to slide on a

45 °

rough incline than on the smooth incline. The coefficients of friction for the rough incline is

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KCET (UG)

IMPORTANT

Physics Crash Course KCET (UG)>Chapter 6 - Friction>Exercise 1>Q 40

A block

A

kept on an inclined surface just begins to slide if the inclination is

30 °

. The block is replaced by another block

B

and it is found that it just begins to slide if the inclination is

40 °

EASY

KCET (UG)

IMPORTANT

Physics Crash Course KCET (UG)>Chapter 6 - Friction>Exercise 1>Q 41

A body takes time

t

to reach the bottom of an inclined plane of angle

θ

with the horizontal. If the plane is made rough, time taken now is

2 t

. The coefficient of friction of the rough surface is

MEDIUM

KCET (UG)

IMPORTANT

Physics Crash Course KCET (UG)>Chapter 6 - Friction>Exercise 1>Q 42

The minimum force required to move a body upon an inclined plane is three times the minimum force required to prevent the body from sliding down the plane. If the coefficient of friction between the body and the inclined plane is

\frac{1}{2 \sqrt{3}}

, then what will be the angle of the inclined plane?

EASY

KCET (UG)

IMPORTANT

Physics Crash Course KCET (UG)>Chapter 6 - Friction>Exercise 1>Q 43

Value of $θ$ is increased gradually from $θ = 0 .$ At $θ = \tan^{- 1} (\frac{1}{2})$ both the blocks just start slipping. Than value of $μ_{2}$ is: $(g = 10 m s^{- 2})$

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A block rests on a rough inclined plane making an angle of 30° with the horizontal. The coefficient of static friction between the block and the plane is 0.8 If the frictional force on the block is 10 N, the mass of the block is g=10 ms-2

Important Questions on Friction

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A block rests on a rough inclined plane making an angle of $30 °$ with the horizontal. The coefficient of static friction between the block and the plane is $0.8$ If the frictional force on the block is $10 N,$ the mass of the block is $(g = 10 {ms}^{- 2})$