Laws Of Motion Question 369
Question: A uniform metal chain is placed on a rough table such that one end of chain hangs down over the edge of the table. When one-third of its length hangs over the edge, the chain starts sliding. Then, the coefficient of static friction is [Kerala PET 2005]
Options:
A) $ \frac{3}{4} $
B) $ \frac{1}{4} $
C) $ \frac{2}{3} $
D) $ \frac{1}{2} $
Show Answer
Answer:
Correct Answer: D
Solution:
$ {{\mu } _{s}}=\frac{\text{Lenghtof the chain hanging from the table }}{\text{Length of the chain lying on the table}} $
$ =\frac{l/3}{l-l/3}=\frac{l/3}{2l/3}=\frac{1}{2} $
