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A block of mass 2kg rests on a plane inclined at an angle of 30with the horizontal. The coefficient of friction between the block and the surface is 0.7. The frictional force acting on the block is

  • a)
    9.8N

  • b)
    0.7×9.8×3–√N

  • c)
    12.5 N

  • d)
    0.7×9.8N

Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
A block of mass 2kg rests on a plane inclined at an angle of 30owith t...
Since the frictional force is self adjusting, the weight component acting down the inclined plane is mgsin?, which comes out to be 2 x 10 sin 30 = 10 N. So the frictional force balancing this downward force will also be 10 N acting up the plane.

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A block of mass 2kg rests on a plane inclined at an angle of 30owith t...
The force due to gravity acting on the block is given by Fg = mg = 2kg x 9.8m/s^2 = 19.6N.

The force of friction acting on the block is given by Ff = μN, where μ is the coefficient of friction and N is the normal force acting on the block. The normal force is the component of the force due to gravity that is perpendicular to the surface of the plane. In this case, it is given by N = mg cos(30o) = 2kg x 9.8m/s^2 x cos(30o) = 16.96N.

Thus, the force of friction acting on the block is Ff = 0.7 x 16.96N = 11.87N.

Therefore, the frictional force acting on the block is approximately 11.87N, which is closest to option (a) 9.8N.
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A block of mass 2kg rests on a plane inclined at an angle of 30owith the horizontal. The coefficient of friction between the block and the surface is 0.7. The frictional force acting on the block isa)9.8Nb)0.7×9.8×3–√Nc)12.5 Nd)0.7×9.8NCorrect answer is option 'A'. Can you explain this answer? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about A block of mass 2kg rests on a plane inclined at an angle of 30owith the horizontal. The coefficient of friction between the block and the surface is 0.7. The frictional force acting on the block isa)9.8Nb)0.7×9.8×3–√Nc)12.5 Nd)0.7×9.8NCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A block of mass 2kg rests on a plane inclined at an angle of 30owith the horizontal. The coefficient of friction between the block and the surface is 0.7. The frictional force acting on the block isa)9.8Nb)0.7×9.8×3–√Nc)12.5 Nd)0.7×9.8NCorrect answer is option 'A'. Can you explain this answer?.
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