Question

1.A body of mass 10kg is on a rough inclined plane having an inclination of 30 with the horizontal
If coefficient of friction between the surfaces of contact of the body and the plane is 0.5. find the
least force required to pull the body up the plane.
1) 80.5N
2) 91.4N
3) 85.4N
4) 78.4N
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Answer 1

Answer:

Correct Answer: B

Solution :

               F=mg(sinθ+μcosθ)                =10×9.8(sin30∘+0.5cos30∘)=91.4 N.

Answer 2

Answbasic concept ..first break into free body diagram and then firm equations taking directions carefully