Two blocks A (1 kg) and B (2 kg) are connected by a string passing over a smooth pulley as shown in the figure. B rests on a rough horizontal surface and A rests on B. The coefficient of friction betw

Question

Two blocks A (1 kg) and B (2 kg) are connected by a string passing over a smooth pulley as shown in the figure. B rests on a rough horizontal surface and A rests on B. The coefficient of friction between A and B is the same as that between B and the horizontal surface. The minimum horizontal force $F$ required to move A to the left is 25 N. The coefficient of friction is: (Take $g = 10$ m/s²)

Options:

Answer:

B

Solution:

As A moves left the string drags B right.
On A
$F = T + 10 μ .$
On B
$T = 10 μ$
(friction from A) $+ 30 μ$ (friction from ground) = $40 μ$ .
So
$F = 50 μ = 25 N$ and
$μ = 0.5.$
Option B.

TestHub · Accepted Answer

As A moves left the string drags B right. On A F = T + 10 μ . On B T = 10 μ (friction from A) + 30 μ (friction from ground) = 40 μ . So F = 50 μ = 25 N and μ = 0.5. Option B.

Physics - NLM Question with Solution | TestHub

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