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प्रश्न
Define 1 joule of work.
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उत्तर
Joule is the SI unit of work. Work done is said to be of 1 Joule when a force of 1 Newton moves a body by 1 m along the direction of the force applied.
संबंधित प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
A coolie does no work against the force of gravity while carrying a luggage on a road.
The S.I. unit of work is
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
Write the expression for work done by a force.
Give reasons for the following. No work is done if a man is pushing against a wall.
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
Give one example in which a force does zero work.
How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
Its moment of a force scalar or a vector quantity?
Give two examples of couple actions in our daily life.
Complete the following sentences:
1 H.P. = ........ W.
Name the physical quantity whose MKS units are kgm2s-3.
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.
Give an example
Chemical energy changes to heat energy.
