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प्रश्न
When is work said to be done by a force?
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उत्तर
The condition for work done is the displacement of the body when force is applied.
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संबंधित प्रश्न
How is work related to energy?
A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate:
- the work done, and
- the power developed by him. Take g = 10 N kg-1
A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
Fill in the boxe to show the corresponding energy transformation.
A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m long on to a platform, 2.5 m above the ground.
(i) Calculate the mechanical advantage of the inclined plane. (ii) Calculate the effort applied by the coolie.
(iii) In actual practice, the coolie needs to apply more effort than what is calculated. Give one reason why you think the coolie needs to apply more effort.
Write the two main conditions are needed for work to be done?
