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प्रश्न
Is work done a scalar or a vector physical quantity?
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उत्तर
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction.
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संबंधित प्रश्न
An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?
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.
The power of a motor is 40 kW. At what speed can the motor raise a load of 20,000 N?
Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
Write an expression for work done by a force depends?
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.
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
