MEDIUM
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The acceleration of a body moving up a rough inclined plane when it is pulled up by a force, depends only on its mass.
Reason
Frictional force acts in the direction of the applied force.

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Important Questions on Laws of Motion

MEDIUM
A block of mass 10 kg is kept on a rough inclined plane as shown in the figure. A force of 3 N is applied on the block. The coefficient of static friction between the plane and the block is 0.6. What should be the minimum value of force P, such that the block does not move downward? (take g=10 m s-2)
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MEDIUM
A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches 30°, the box starts to slip and slides 4.0 m down the plank in 4.0 s. The coefficients of static and kinetic friction between the box and the plank will be, respectively:
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MEDIUM
The time taken by an object to slide down 45° rough inclined plane is n times as it takes to slide down a perfectly smooth 45° incline plane. The coefficient of kinetic friction between the object and the incline plane is:
MEDIUM
A block of mass m slides down the plane inclined at angle 30° with an acceleration g4 . The value of coefficient of kinetic friction will be :
MEDIUM
A body of mass m is launched up on a rough inclined plane making an angle of 30° with the horizontal. The coefficient of friction between the body and plane is x5, if the time of ascent is half of the time of descent. The value of x is
HARD
A box when dropped from a certain height reaches the ground with a speed v . When it slides from rest from the same height down a rough inclined plane inclined at an angle 45o to the horizontal, it reaches the ground with a speed v3 . The coefficient of sliding friction between the box and the plane is (acceleration due to gravity is 10 m s-2 )
MEDIUM

Consider a block kept on an inclined plane (inclined at 45°) as shown in the figure. If the force required to just push it up the incline is 2 times the force required to just prevent it from sliding down, the coefficient of friction between the block and inclined plane (µ) is equal to :

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MEDIUM
When a body is placed on a rough plane (coefficient of friction=μ) inclined at an angle θ to the horizontal, its acceleration is (acceleration due to gravity =g)
MEDIUM
The normal reaction N for a vehicle of 800 kg mass, negotiating a turn on a 30° banked road at maximum possible speed without skidding is ____ ×103 kg m s-2.
MEDIUM
If a block of mass ' m ' placed on a plane inclined at an angle θ, is on the verge of sliding, then the coefficient of friction between the block and the plane is given by
EASY
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
MEDIUM

A brick of mass 2 kg slides down an incline of height 5 m and angle 30°. If the coefficient of friction of the incline is 123, the velocity of the block at the bottom of the incline is (Assume the acceleration due to gravity is 10 m/s2)

MEDIUM

A block of mass 5 kg is kept against an accelerating wedge with a wedge angle of 45° to the horizontal. The co-efficient of friction between the block and the wedge is μ=0.4. What is the minimum absolute value of the acceleration of the wedge to keep the block steady. Assume g=10 m s-2

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EASY
A block of mass m is placed over rough inclined plane having inclination 30°. The co-efficient of friction between the block and the inclined plane is 0.75. The contact force on the block is

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MEDIUM

If a block takes thrice as much time to slide down a 45o rough inclined plane as it takes to slide down a similar smooth plane. Then coefficient of friction is

HARD
A small block of mass of 0.1 kg lies on a fixed inclined plane PQ which makes an angle θ with the horizontal. A horizontal force of 1 N acts on the block through its centre of mass as shown in the figure. The block may remains stationary if (take g=10 m s-2)
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EASY
A body takes n times as much time to slide down a 45° rough incline as it takes to slide down a smooth 45° incline. The coefficient of friction between the body and the incline will be
MEDIUM

Represent the union of two sets by Venn diagram for each of the following.

X={x | x is a prime number between 80 and 100}

Y={y | y is an odd number between 90 and 100}

EASY
A box of mass 8 kg is placed on a rough inclined plane of inclination 30o. Its downward motion can be prevented by applying a horizontal force F, then value of F for which friction between the block and the incline surface is minimum, is
EASY
A body of mass 10 kg is lying on a rough plane inclined at an angle of 30° to the horizontal and the coefficient of friction is 0.5. The minimum force required to pull the body up the plane is