Q1. A force of 200 N is applied to a block of mass 20 kg on an inclined plane at 53 º with the horizontal .
(i) What will be the acceleration of the block in downward direction ?
(II) How much force is required to move it in up along the plane ?
(iii) How much force is required to keep the body at rest on the inclined plane ?
Q2. Write down some of the advantages and disadvantages of friction
Q3. A 20 kg block is initially at rest on a rough horizontal surface. A horizontal force of 75 N is required to set the block in motion. After it is in motion, ahorizontal force of 60 N is required to keep the block moving with constant speed. Find the coefficient of static and kinetic friction .
Q4. A body of 5 kg weight kept on a rough inclined plane of angle 30º starts sliding with a constant velocity. Then find the coefficient of friction . (assume g = 10 m/s²)
Q5. Define the following terms
Sliding friction , limiting friction , angle of friction , coefficient of kinetic friction , angle of repose .