Q1. A force of 200 N is applied to a block of mass 20 kg on an inclined plane at 37 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 ?
Q2. The coefficient of friction for a block of mass 10 kg and a surface is 0.3 . Find the force of friction and the acceleration of the block if the applied force is 10 N , 30 N , 50 N and 0 N .
Q3. Explain why
(i) rolling friction helps in motion
(ii) static friction is a self adjusting force
Q4. State the laws of friction
Q5. Define the following terms
Sliding friction , limiting friction , angle of friction , coefficient of kinetic friction , angle of repose .