Friction between any two surfaces in contact is the force that opposes the relative motion between them The force of limiting friction (F) between any two surfaces in contact is directly proportional to the normal reaction (R) between them `F prop R` or `F = mu R` where `mu` is coefficient of limiting friction If `theta` is angle of friction then `mu = tan theta`
The angle of friction in the above question is .

Friction between any two surfaces in contact is the force that opposes the relative motion between them The force of limiting friction (F) between any two surfaces in contact is directly proportional to the normal reaction (R) between them F prop R or F = mu R where mu is coefficient of limiting friction If theta is angle of friction then mu = tan theta A force of 49N is just able to move a block of wood weighing 10kg on a rough horizontal surface The coefficient of friction is .

The limiting friction between two surfaces depends

If mu = coefficient of friction and theta is the angle of friction, then

The limiting friction between two surface does not depend

Why the coefficient of friction between two surfaces in contact varies directly with the normal reaction ?