Question

A block of metal is lying on the floor of a bus. Find the maximum acceleration which can be given to the bus so that the block may remain at rest.

• A. $\mu g$
• B. $\frac{\mu }{g}$
• C. ${\mu }^{2}g$
• D. $\frac{g}{\mu }$

Answer 1

Answer: (A)

$\mu g$

Let the block has mass m.
For block to be rest, $ma=\mu N$
$\Rightarrow ma=\mu \left(mg\right)\Rightarrow a=\mu g$