Laws of Motion ...

Two balls of masses m₁ and m₂ are separated from each other by a powder change placed between them. The whole system is at rest on the ground. suddenly the powder charge explodes and masses are pushed apart. The mass m₁ travels a distance s₁ and stops. If the coefficients of friction between the balls and ground are same, the mass m₂ stops after travelling the distance

In the figure shown, a block of weight 10 N is resting on a horizontal surface. The coefficient of static friction between the block and the surface µ_s = 0.4. A force of 3.5 N will keep the block in uniform motion, once it has been set in motion. A horizontal force of 3 N is applied to the block, then the block will

A lift is moving downwards with an acceleration equal to acceleration due to gravity. A body of mass m kept on the floor of the lift is pulled horizontally. If the coefficient of friction is µ, then the frictional resistance offered by the body is

A uniform rope of length l lies on a table. If the coefficient of friction is µ, then the maximum length l of the part of this rope which can overhang from the edge of the table without sliding down is

Which of the following statements is not true

A block of 1 kg is stopped against a wall by applying a force F perpendicular to the wall. If µ = 0.2, then minimum value of F will be

A heavy uniform chain lies on a horizontal table-top. If the coefficient of friction between the chain and table surface is 0.25, then the maximum fraction of length of the chain, that can hang over one edge of the table is

The coefficient of static friction, µ_s, between block A of mass 2 kg and the table as shown in the figure is 0.2. What would be the maximum mass value of block B, so that the two blocks do not move ? The string and the pulley are assumed to be smooth and massless.(g = 10 m/s₂)

Work done by a frictional force is

When two surfaces are coated with a lubricant, then they