Friction

The coin is notating with a plate without sliding If the coefficient of friction between the coin and plane is mu = 0.75 the friction between the coin and plate is If the plate is rotating along and the coin is gently placed on the rotating plate, the frictional force on the coin is

In the arrangement shown in Fig there is no friction between of mass 2m and ground but there is friction between the block of masses m is stationary with respect to block of mass 2m The value of friction between m and 2m is

STATEMENT - 1 : If an object is at rest then there should not be any friction on it . STATEMENT - 2: If an object is moving then the friction acting on it has to be kinetic . STATEMENT -3 : If an object is at rest then kinetic friction cannot act on it.

Statement I: The coefficient of friction can be greater than unity. Statement II: The force of friction is dependent on normal reaction and the ration of force of friction and normal reaction cannot exceed unity.

The angle between the resultant contact force and the normal force exerted by a body on the other is called the angle of friction. Show that it lamda be the angle of friction and mu the coefficient of static friction. lamdaletan^-1mu .

(i) Explain why friction is necessary to make the disc to roll in the direction indicated. (ii) Give the direction of frictional force at B , and the sense of frictional torque, before perfect rolling begins. (iii) What is the force of friction after perfect rolling begins?

A vehicle moves safe on a rough, curved and unbanked road. Then a) The direction of static friction is radially out wards b) The direction of static friction is radially inwards c) The direction of kinetic friction is tangential to curved path d) Static friction does not exist

In the figure shown a ring of mass M and a block of mass m are in equilibrium. The string is light and pulley P does not offer any friction and coefficient of friction between pole and M is mu. The frictional force offered by the pole to M is