A block of mass $5\, kg$ is $(i)$ pushed in case $(A)$ and $(ii)$ pulled in case $(B)$, by a force $F = 20\, N$, making an angle of $30^o$ with the horizontal, as shown in the figures. The coefficient of friction between the block and floor is $\mu = 0.2$. The difference between the accelerations of the block, in case $(B)$ and case $(A)$ will be ........ $ms^{-2}$ .$(g = 10\, ms^{-2})$
$0.4$
$3.2$
$0$
$0.8$
The frictional force acting on $1 \,kg$ block is .................. $N$
If the normal force is doubled, the coefficient of friction is
A block of mass $50 \,kg$ can slide on a rough horizontal surface. The coefficient of friction between the block and the surface is $0.6$. The least force of pull acting at an angle of $30^°$ to the upward drawn vertical which causes the block to just slide is ........ $N$
The limiting value of static friction between two contact surfaces is ...........
A hockey player is moving northward and suddenly turns westward with the same speed to avoid an oopponent. The force that acts on the player is