Question
Figure shows four blocks that are being pulled along a smooth horizontal surface. The masses of the blocks and tension in one string are given. The pulling force $F$ is ............ $ N$
✓
Answer
All blocks will move with same acceleration
$a=\frac{6}{4+2}=1 \mathrm{m} / \mathrm{s}^{2}$
$\mathrm{Fcos} 60^{\circ}=$ total mass $\times \mathrm{acc}$
$\mathrm{Fcos} 60^{\circ}=(8+6+4+2) \times 1$
$\mathrm{F} \times \frac{1}{2}=20 \Rightarrow \mathrm{F}=40 \mathrm{N}$
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