Kinetic Friction - Practice Questions & MCQ

A rocket is fired  vertically from the earth with an acceleration of 2g, where g is the gravitational acceleration.  On an inclined plane inside the rocket, making an angle θ with the horizontal, a point object of mass m is kept.  The minimum coefficient of friction ^µ_min between the mass and the inclined surface such that the mass does not move is :

The upper half of an inclined plane with inclination  is perfectly smooth while the lower half is rough .A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given by

A uniform solid cylindrical roller of mass 'm' is being pulled on a horizontal surface with force F parallel to the surface and applied at its center. If the acceleration of the cylinder is 'a' and it is rolling without slipping then the value of 'F' is :centre