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...

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...

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 :-...

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 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...

In the shown arrangement if f1, f2 and T be the frictional forces on 2 kg block, 3kg block & tension in the string respectively, then their values are:...

Two persons, pull each other through a massless rope in ′tug of war′ game. Who will win ?

A bead of mass m is located on a parabolic wire with its axis vertical and vertex directed towards downward as in figure and whose equation is x2 = ay. If the coefficient of friction is μ, the hi...

A plank is held at an angle a to the horizontal (Fig.) on two fixed supports A and B. The plank can slide against the supports (without friction) because of its weight Mg. With what acceleration and i...

Two identical blocks of same masses are placed on a fixed wedge as shown in figure. Coefficient of friction between all the contact surfaces is μ. Choose the correct alternative...

In the above question if the external force is applied on 3 kg block, then acceleration of the 3 kg block will be :

(i) From the figure shown, find out acceleration of 3 kg block.

Given mA = 30 kg, mB = 10 kg, mC = 20 kg. Between A and B friction coefficient m1 = 0.3, between B and C driction coefficient μ2 = 0.2 and between C and ground μ3 = 0.1. The least horizontal...

The two blocks, m = 10 kg and M = 50 kg are free to move as shown. The coefficient of static friction between the blocks is 0.5 and there is no friction between M and the ground. A minimum horizontal ...

A block of mass 2 kg is given a push horizontally and then the block starts sliding over a horizontal plane. The figure shows the velocity-time graph of the motion. The co-efficient of sliding frictio...

A body is projected up along the rough inclined plane from the bottom with some velocity. It travels up the incline and then returns back. If the time of ascent is ta and time of descent is td, then...

A worker wishes to pile a cone of sand into a circular area in his yard. The radius of the circle is r, and no sand is to spill onto the surrounding area. If μ is the static coefficient of fricti...

In the given figure the coefficient of friction between 4kg and 5 kg blocks is 0.2 and between 5 kg block and ground is 0.1 respectively. Choose the correct statements...

A block of mass 15 kg is resting on a rough inclined plane as shown in figure. The block is tied up by a horizontal string which has a tension of 50 N. The coefficient of friction between the surfaces...