Friction Questions

Two masses m1 = 5kg and m2 = 10kg, connected by an inextensible string over a frictionless pulley, are moving as shown in the figure. The coefficient of friction of horizontal surface is 0.15. The min...

Which one of the following statements is incorrect ?

A body initially at rest and sliding along a frictionless track from a height h (as shown in the figure) just completes a vertical circle of diameter AB = D. The height h is equal to :-...

The upper half of an inclined plane with inclination φ is perfectly smooth while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coeffic...

A system consists of three masses m1, m2 and m3 connected by a string passing over a pulley P. The mass m1 hangs freely and m2 and m3 are on a rough horizontal table (the coefficient of friction = &#9...

A body is sliding down an inclined plane (angle of inclination 45o). If the coefficient of friction is 0.5 and g = 9.8 m/s2. then the acceleration of the body downwards in m/s2 is :-...

In the figure, a ladder of mass m is shown leaning against a wall. It is in static equilibrium making an angle θ with the horizontal floor. The coefficient of friction between the wall and the la...

A block of mass m is placed on a surface with a vertical cross-section given by y =. If the coefficient of friction is 0.5, the maximum height above the ground at which the block can be placed without...

A block of mass 2 kg on a rough inclined plane making an angle of 30o with horizontal. The coefficient of static friction between the block and the plane is 0.7. The frictional force on the block is...

During paddling of a bicycle, the force of friction exerted by the ground on the two wheels it such that is acts

A block of mass 0.1 kg is held against a wall applying a horizontal force of 5 N on the block. If the coefficient of friction between the block and the wall is 0.5, the magnitude of the frctional forc...

If a machine is lubricated with oil

Consider a car moving on a straight road with a speed of 100 m/s. The distance at which car can be stopped is [μ2 = 0.5]

A block rests on a rough inclined plane making an angle of 30o 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 1...

A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is...

A marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped by friction in 10 s. then the coefficient of friction is

When the two surfaces are coated with the lubricant, then they will :

A block A with mass 100 kg is resting on another block B of mass 200 kg. As shown in figure a horizontal rope tied to a wall holds it. The coefficient of friction between A and B is 0.2 while coeffici...

A body is pulled along a rough horizontal surface with a velocity 6 m/s if the body comes to rest after travelling 9m, then coefficient of sliding friction, is (Take g = 10 m/s2)...

A body of mass 2 kg is being dragged with uniform velocity of 2 m/s on a rough horizontal plane. The coefficient of friction between body and the surface is 0.2. The amount of heat generated in 5 seco...