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प्रश्न
State the condition when the work done by the force is negative.
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उत्तर
Work done by a force is negative when the displacement is in the direction opposite to the force.
संबंधित प्रश्न
When a body is placed on a table top, it exerts a force equal to its weight downwards on the table top but does not move or fall
1) Name the force exerted by the table top
2) What is the direction of the force?
Give an example when work done by the force of gravity acting on a body is zero even though the body gets displaced from its initial position.
A man spends 7.4 KJ energy in displacing a body by 74 m in the direction in which he applies force in 2.5 s. Calculate the force applied.
State the principle of moments.
What do you mean by a centrifugal force?
A man raises a box of mass 50 kg to a height of 2 m in 20s, while another man raises the same box to the same height in 50s. Calculated:
- the work done, and
- the power developed by each man. Take g = 10 N kg-1.
What happens to the power if the time for doing work is reduced from t second to t/10 second?
State the S.I. and C.G.S. units of energy. How are they related?
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person walks on a levelled road.
