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प्रश्न
State the condition when the work done by the force is positive
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उत्तर
Work done by a force is positive when the displacement is in the direction of the force.
संबंधित प्रश्न
A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes. Compare:
- The work done by them.
- The power developed by them.
State the condition when the work done by a force is positive. Explain with the help of examples.
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
State and define the S.I. unit of work.
Name the quality which is measured in Wh.
How much force is applied on a body when 150 J of work is done in displacing the body through a distance of 10 m in the direction of the force?
State two conditions for work to be done.
Justify the statement. “Power can be expressed as the product of force and velocity.”
State the practical unit mainly used in mechanical engineering and write down its equivalent in watt.
A coolie carrying a load on his head and moving on a frictionless horizontal platform does no work. Explain the reason why.
