NEETPhysicsLaws of Motion
A block of mass m is on an inclined plane of angle . The coefficient of friction between the block and the plane is and > . The block is held stationary by applying a force P parallel to the plane. The direction of force pointing up the plane is taken to be positive. As P is varied from P₁=m g( - ) to P₂=m g( + ) , the frictional force f versus P graph will look like
Correct answer
0
Step-by-step solution
When aligned P & =m g( - ) f & = m g (upwards) when P & =m g f & =0 aligned and when P=m g( + ) f= m g (downwards) Hence friction is first positive, then zero and then negative. correct option is (a).