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प्रश्न
उत्तर
Work done depends upon:
(i) the magnitude and direction of the applied force, and
(ii) the displacement it produces.
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संबंधित प्रश्न
State the S.I. unit of energy.
A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The loss in potential energy of the body,
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
What do you mean by degradation of energy?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
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.
In case of negative work, the angle between the force and displacement is :
Name the physical quantity whose SI unit is Nm.
A boy does work when he pushes against a brick wall. (yes/no).
What is the SI unit of work?
When you move upstairs, do you perform some work?
Fill in the boxe to show the corresponding energy transformation.
How is horse power related to the S. I. unit of power?
A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of the body.
What do you understand by the term energy? Is energy a scalar or vector? How is the energy possessed by a body measured?
Mention whether work is done or not in the following activity.
| S. No | Activity | Work done or not done |
| 1. | Pushing the door | |
| 2. | Holding a doll | |
| 3. | Sitting in a bus | |
| 4. | Pushing a wall | |
| 5. | Digging soil |
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Suma is swimming in a pond.
