A block pressed against the vertical wall is in equilibrium. The minimum coefficient of  friction is:-

A uniform chain of length $L$ which hanges partially from a table, is kept in equilibrium by friction. The maximum length that can withstand without slipping is $l$ , then coefficient of friction between the table and the chain is

A $2\,kg$ block slides on a horizontal floor with a speed of $4\, m/s$. It strikes a  uncompressed spring, and compresses it till the block is motionless. The kinetic friction  force is $110\,N$ and spring constant is $1000\, N/m$. The spring compresses by ........ $cm$

A body of mass m rests on horizontal surface. The coefficient of friction between the body and the surface is $\mu .$ If the mass is pulled by a force $P$ as shown in the figure, the limiting friction between body and surface will be

What is friction ? What is impending motion ?

As shown in the figure a block of mass $10\,kg$ lying on a horizontal surface is pulled by a force $F$ acting at an angle $30^{\circ}$, with horizontal. For $\mu_{ s }=0.25$, the block will just start to move for the value of $F..........\,N$ : $\left[\right.$ Given $\left.g =10\,ms ^{-2}\right]$