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प्रश्न
What are the quantities on which the amount of work done depends? How are they related to work?
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उत्तर
The work done by a force on a body depends on two factors:
(i) Magnitude of force applied
(ii) Displacement in the direction of force applied
The relation between work (W), force (F) and displacement (S) is given by following equation:
W = F.S. cos θ
Where,
(W) - Work done
(F) - Force
(S) - Displacement
(θ) - Angle between the force applied and displacement of the body.
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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
When is work said to be done by a force?
Differentiate between energy and power.
Find the kinetic energy of a body of mass 1 kg moving with a uniform velocity of 10 m s-1.
Define 1 joule of work.
Complete the following sentences:
1 H.P. = ........ W.
A bullet is of mass 'm' g and is moving with a velocity 'v' m/s. Find the kinetic energy of the bullet when
(a) The mass is doubled,
(b) The velocity is tripled.
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 |
