Laws Of Motion Question 56
Question: A body of mass m rests on horizontal surface. The coefficient of friction between the body and the surface is $ \mu . $ If the mass is pulled by a force P, the limiting friction between body and surface will be [BHU 2004]
Options:
A) $ \mu mg $
B)$ \mu [ mg+( \frac{P}{2} ) ] $
C) $ \mu [ mg-( \frac{P}{2} ) ] $
D) $ \mu [ mg-( \frac{\sqrt{3}P}{2} ) ] $
Show Answer
Answer:
Correct Answer: C
Solution:
Normal reaction $ R=mg-P\sin 30^{o} $
$ =mg-\frac{P}{2} $
Limiting friction between body and surface is given by, $ F=\mu R=\mu ( mg-\frac{P}{2} ) $ .
