H C Verma Solutions for Chapter: Friction, Exercise 2: OBJECTIVE I

A body of mass $M$ is kept on a rough horizontal surface (friction coefficient$=\mu$). A person is trying to pull the body by applying a horizontal force but the body is not moving. The force by the surface on the body is $F$, where

A scooter, starting from rest, moves with a constant acceleration for a time $\Delta t_1,$ then with a constant velocity for the next $\Delta t_2$ and finally with a constant deceleration for the next $∆t_3$ to come to rest. A $500 \mathrm{N}$ man, sitting on the scooter behind the driver, manages to stay at rest with respect to the scooter without touching any other part. The force exerted by the seat on the man is

Consider the situation shown in the figure. The wall is smooth but the surfaces of $A$ and $B$ in contact are rough. The friction on $B$ due to $A$, in equilibrium

Consider the situation shown in the figure. Suppose all the surfaces are rough. The direction of friction on $B$ due to $A$

Two cars of unequal masses, use similar tyres. If they are moving at the same initial speed, the minimum stopping distance

In order to stop a car in shortest distance on a horizontal road, one should

A block $A$ kept on an inclined surface just begins to slide if the inclination is $30°$. The block is replaced by another block $B$ and it is found that it just begins to slide if the inclination is $40°$.

A boy of mass $M$ is applying a horizontal force to slide a box of mass $M^{\text{'}}$ on a rough horizontal surface. The coefficient of friction between the shoes of the boy and the floor is $\mu$ and that between the box and the floor is ${\mu }^{\text{'}}$. In which of the following cases, it is certainly not possible to slide the box?