Supose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.

Suppose your writing desk is tiltrd a little .A book kept on it starts sliding down. Show the direction of frictional force acting on it.

In which direction the force of friction acts?

A disc spinning clockwise about its axis with angular velocity omega_0 is set on a rough horizontal plane[Fig.]. What si the direction of frictional force at point P and sense of frictional torque ,before pure rolling starts? .

Write an expression for the work done when a force is acting on an object in the direction of its displacment.

Write an expression for the work done when a force is acting on an object in the direction of its displacement.

A girl of 40 kg mass jumps with a horizontal velocity of 5ms'1 on a stationary trolley. The wheels of the skate are frictionless. What will be the velocity of the girl in the position of start of the trolley. Suppose no unbalanced force is acting in the horizontal direction.(mass of trolley is 3 kg)