If force `F` is gradually increased from zero to `50 N` , tehn (a) find the minimum contact force, (b) find the maximum value of angle of friction when `F = 30 N` , (d) find the angle of friction when the block is moving with constant velocity and ( e) sketch a graph between friction and applied force.

Find the minimum value of F and the tension in the string so that the blocks move with constant velocity. The coefficient of friction at all surfaces is mu . (a) (b) ( c ) (d)

In Fig force F is gradually increased from zero Draw the graph between applied force F and tension T is the string . The coefficient of string friction between the block and the ground is mu_(s)

In Fig force F is gradually increased from zero Draw the graph between applied force F and tension T is the string . The coefficient of string friction between the block and the ground is mu_(s)

If a force of 50 N is applied on a body and it is still at rest, then find the magnitude of static frictional force acting on it.

Assertion: Friction is a self-adjusting force. Reason: A block on the horizontal table is acted upon by a force F. The graph of frictional force against applied force F is.

Assertion: Friction is a self-adjusting force. Reason: A block on the horizontal table is acted upon by a force F. The graph of frictional force against applied force F is.

A block of mass 0.1 kg is kept pressed onto a wall by applying a horizontal force of 5 N. If the coefficient of friction between the block and the wall is 0.5, find the force of friction on the block.

A block lies on a floor. (a) What is the magnitude of the frictional force on it from the floor ? (b) If a horizontal force of 5N is now applied to the block. But the block dose not move. What is the magnitude of the fricition on it ? (c) If the maximum value f_(c "max") of the static frictional force on the block is 10 N, will the block move if the magnitude of the horizontally applied force is 8 N? (d) If it is 12 N ? (e) What is te magnitude of the frictional force in part (c) ?