Question

Five identical cubes each of mass $‘m^{\prime }$ are on a straight line with two adjacent faces in contact on a horizontal surface as shown in the figure. Suppose the surface is frictionless and a constant force $P$ is applied from left to right to the end face of $A$, then net force on each cube is

• A. $\frac{P}{5}$
• B. $\frac{2P}{5}$
• C. $\frac{3P}{5}$
• D. $\frac{P}{10}$

Answer 1

The correct option is A $\frac{P}{5}$

Acceleration on system $=\frac{P}{5m}$


$P-F_{AB}=ma$
$P-F_{AB}=\frac{mP}{5m}$
$P-F_{AB}=\frac{P}{5}$
Thus, resultant force between $A$ and $B$ is $\frac{P}{5}$