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प्रश्न
Work done = Force × ........................................
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उत्तर
Work done = Force ×distance moved in direction of force.
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संबंधित प्रश्न
A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (see the given figure). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
What are the two kinds of mechanical energy?
A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1.
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
A boy pulls a box up to 10 m with a force of 5 kgf. Calculate the work done by him.
Give an example
Light energy changes to electrical energy.
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
The weights of two bodies are 2.0 N and 2.0 kgf respectively what is the mass of each body?
