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What is the ratio of SI units to CGS units of 'work'?
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Give two examples of work done.
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On what factors does the work done by a force depend?
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Write an expression for work done by a force depends?
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Write an expression for the work done against gravity.
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No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
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Is power a scalar quantity?
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Can every force produce work?
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Distinguish between work and power.
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Complete the following sentences:
The SI unit of work is ....... and of power is .......
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Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
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Complete the following sentences:
Joule is the unit of .......
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Complete the following sentences:
1 H.P. = ........ W.
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A weight lifted a load of 200 kgf to a height of 2.5 m in 5 s. calculate: (i) the work done, and (ii) the power developed by him. Take g= 10 N kg-1.
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A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
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Can work done be zero even if force acts on the body?
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