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Question

# Two block A and B of equal mass 3 kg each are connected over a massless pulley as shown in figure. The block A is placed on a rough inclined plane of angle 30∘. The coefficient of friction between block A and inclined plane is 0.6. The friction force acting on the block A is (Assume g=10 ms−2 )

A
Zero
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B
15.6 N
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C
18 N
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D
15 N
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Solution

## The correct option is D 15 N mBg=30 N mAg sin θ=30×12=15 N Net pulling force =30−15=15 N f1=μmAg cos θ =0.6×30×√32 =9√3=9×1.732=15.6 N ∵f1> pulling force ∴f= pulling force =15 N ∴ (d)

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