Physics - NLM Question with Solution | TestHub
When a body is about to move on a surface in the direction of applied force, the resultant reaction force makes a limiting angle with normal. If direction of applied force is gradually changed through an angle 360°, keeping the force in the same plane the resultant reaction of the surface, generates a right circular cone with semicentral angle . This inverted cone with semicentral angle is called cone of friction. If the resultant reaction force of the surface is
(i) within this cone the body is stationary
(ii) on the surface of cone, the motion of body is impending.
(iii) outside the cone of friction, the body is in motion.
It can be inferred easily that if direction of net force [force of gravity + applied force] exerted on object placed on a surface is such that its line of action is inside the frictional cone, then object will not move regardless of magnitude of force.
An object is kept on rough horizontal surface having coefficient static friction , as shown. A force F is applied on the block at an angle 45°.
Options:
Answer:
Solution:
Resultant of F and mg lies in frictional cone, so object will not move.
