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Question

A block rests on a rough inclined plane making an angle of 30o with the horizontal. The coefficient of static friction between the block and the plane is 0.8. If the frictional force on the block is 10N the mass of the block (in kg) is (take g=10m/s2)

A
2.0
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B
4.0
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C
1.6
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D
2.5
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Solution

The correct option is A 2.0
Since the entire system is at rest, so following the FBD
balancing the force along the surface of the Inclined Plane, we get

mgsin30o=f
m=f/gsin30o=10/(10X0.5)
m=2kg



957307_1011501_ans_d0956943bc88470cb753d56625238b5c.png

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