Laws Of Motion Question 362

Question: A 20 kg block is initially at rest on a rough horizontal surface.A horizontal force of 75 N is required to set the block in motion.After it is in motion, a horizontal force of 60 N is required to keep the block moving with constant speed.The coefficient of static friction is[AMU 1999]

Options:

A) 0.38

B) 0.44

C) 0.52

D) 0.60

Show Answer

Answer:

Correct Answer: A

Solution:

Coefficient of friction $ {{\mu } _{s}}=\frac{F _{l}}{R}=\frac{75}{mg}=\frac{75}{20\times 9.8} $

$ =0.38 $



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