For the given dimensions shown in figure, find critical value of coefficient of friction `mu`

What is the dimension of coefficient of friction?

Acceleration of block A varies with time as shown in figure the value of coefficient of kinetic friction between block A and B is

Acceleration of block A varies with time as shown in figure the value of coefficient of kinetic friction between block A and B is

Acceleration of block A varies with time as shown in figure the value of coefficient of kinetic friction between block A and B is

The force of friction is doubled. Then coefficient of friction mu

Are the dimensions of coefficient of viscosity and coefficient of friction same?

A force F is applied horizontally on a cylinder in the line of centre as shown in the figure. The cylinder is on a rough surface of coefficient of fricition mu . The direction of the friction force acting on the cylinder will be

A force F is applied horizontally on a cylinder in the line of centre as shown in the figure. The cylinder is on a rough surface of coefficient of fricition mu . The direction of the friction force acting on the cylinder will be