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Nature of Physical World and Measurement-3marks; part2

11th Standard

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Physics

answer the following question:
Time : 00:30:00 Hrs
Total Marks : 15
    Part-A
    5 x 3 = 15
  1. How will you measure the work done? When
    (i) the force acts along the direction of motion of the body and,
    (ii) the force is inclined to the direction of motion of the body?

  2. A weight lifter lifts a mass of 250 kg with a force 5000 N to the height of 5m
    (a) What is the work done by the weight lifter?
    (b) What is the work done by the gravity?
    (c) What is the net work done on the object?

  3. How much work is done by a coolie walking on a horizontal platform with a load on his head? Explain.

  4. Let the two springs A and B be such that kA > kB, On which spring will more work has to be done if they are stretched by the same force?

  5. Compute the work done by the gravitational force for the following cases

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