Laws Of Motion Question 351

Question: A block weighs W is held against a vertical wall by applying a horizontal force F. The minimum value of F needed to hold the block is[MP PMT 1993]

Options:

A) Less than W

B) Equal to W

C) Greater than W

D) Data is insufficient

Show Answer

Answer:

Correct Answer: C

Solution:

Here applied horizontal force F acts as normal reaction. For holding the block Force of friction = Weight of block $ f=W $ therefore $ \mu R=W $ therefore$ \mu F=W $

therefore $ F=\frac{W}{\mu } $ As $ \mu <1 $

$ \therefore \ \ \ F>W $



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