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  4. Three blocks are connected, as shown in the figure. Calculate the minimum force required to move the blocks with constant velocity. The co-efficient of friction at all surfaces is 0.25 . [Assume that rod does not exerts force in vertical direction] <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-hgmuu9acuuqx.png />

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Q. Three blocks are connected, as shown in the figure. Calculate the minimum force required to move the blocks with constant velocity. The co-efficient of friction at all surfaces is $0.25$ .

[Assume that rod does not exerts force in vertical direction]

Question

NTA AbhyasNTA Abhyas 2020Laws of Motion

Solution:

Solution
$F-\frac{3 m g}{4}-\frac{6 m g}{4}-T=0$ ....(i)
Solution
$T-\frac{m g}{4}-\frac{3 m g}{4}=0$ ....(ii)
From equarions (i) and (ii)
$\Rightarrow \, F=13\frac{m g}{4}$