JEE Main & Advanced
Physics
NLM, Friction, Circular Motion
Question Bank
Kinetic Friction
question_answer
A block of mass 50 kg can slide on a rough horizontal surface. The coefficient of friction between the block and the surface is 0.6. The least force of pull acting at an angle of 30° to the upward drawn vertical which causes the block to just slide is [ISM Dhanbad 1994]
A) 29.43 N
B) 219.6 N
C) 21.96 N
D) 294.3 N
Correct Answer:
D
Solution :
For limiting condition \[f=\mu R\] \[F\sin 30{}^\circ =\mu (mg-F\cos 30{}^\circ )\], By solving \[F=294.3\ N\]