What is the angle of friction, if the coefficient of friction between two surfaces is 0.25 ?

Static friction between two surfaces

Static friction between two surfaces

A block slides from an inclined plane of inclination 45^(@) If it takes twice the time with friction than that without friction, the coefficient of friction between block and surface is :

The coefficient of static friction between two surfaces depend on

The coefficient of static friction between two surfaces depend on

The coefficient of static friction between two surfaces depend on

The limiting friction between two surfaces depends