A block is kept on a frictionless inclined surface with angle of inclination α. The incline is given an acceleration a to keep the block stationary. Then a is equal to
g / tanα
g cosecα
g
g tanα
A block of mass 10 kg is placed on a rough horizontal surface whose coeffecient of friction is 0.5.If a horizontal force of 100 N is applied on it,then acceleration of block will be :
10 m/s2
5 m/s2
15 m/s2
0.5 m/s2
When a bicycle is in motion, the force of friction exerted by ground on the two wheels is such that, it acts
In the backward direction on the front wheel and in the forward direction on the rear wheel.
In the forward direction on the front wheel and in the backward direction on the rear wheel.
In the backward direction on both the front and the rear wheels.
In the forward direction on both the front and the rear wheels.
Two iron blocks of equal mass but with double surface area slide down an inclined plane with friction coefficient μ.If the first block with surface area A experience a frictional force f, then the second block with surface area 2A will experience a frictional force
f/2
f
2f
4f
A car turns a corner on a slippery road at a constant speed of 12 m/s. If the coefficient of friction is 0.4, the minimum radius of the arc in metre in which the car turns is
72
36
18
9
A block of mass m is on an inclined plane of angle θ. The coefficient of friction between the block and the plane is μ and tanθ>μ. The block is held stationary by applying a force P parallel to the plane. The direction of force pointing up the plane is taken to be positive. As P is varied from P1 = mg(sinθ-μcosθ) to P2 = mg(sinθ+μcosθ), the frictional force f versus P graph will look like
A block is lying static on the floor.The maximum value of static frictional force on the block is 10 N.If a horizontal force of 8 N is applied to the block,what will be the frictional force on the block ?
2 N
18 N
8 N
10 N
Friction is the result of
gravitational acceleration
molecular interaction
magnetic interaction
nuclear interaction
Which of the following is the dimension of coefficient of friction?
[MLT-2]
[M0L0T0]
[M2LT-2]
[M2LT]
A block of mass 2 kg rests on a rough inclined plane making an angle 300 with the horizontal. The coefficient of static friction between the block and the plane is 0.7. The frictional force on the block is
9.8 N
0.7×9.8 N
