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  4. On a rough table, three blocks are placed as shown in the figure. Mass of each block is m and coefficient of friction for each block is μ. A force F is applied on the first block so as to move the system. The minimum value of F=y μ m g . Find y .

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Q. On a rough table, three blocks are placed as shown in the figure. Mass of each block is $m$ and coefficient of friction for each block is $\mu$. A force $F$ is applied on the first block so as to move the system. The minimum value of $F=y \mu m g .$ Find $y .$Physics Question Image

Laws of Motion

Solution:

Tension $T_{3}$ required to move third block $=\mu \,m g$.
Tension $T_{2}$ to move $2^{\text {nd }}$ block $=3\, \mu m g .$
Force $F$ required to move the first block $=7\, \mu mg$.