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प्रश्न
A body is moved in a direction opposite to the direction of force acting on it. State whether the work is done by the force or work is done against the force
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उत्तर
Work is done against the force.
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संबंधित प्रश्न
State the condition when the work done by a force is positive. Explain with the help of examples.
When a body moves in a circular path, how much work is done by the body? Give reason.
(Hint: The body is acted upon by the centripetal force.)
Differentiate between work and power.
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.
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How much force is applied on a body when 150 J of work is done in displacing the body through a distance of 10 m in the direction of the force?
In the following case write yes, if the work is being done and no if no work is being done.
A man trying to push a wall.
What happens to the power if the time for doing work is reduced from t second to t/10 second?
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A car in neutral gear is coming down the slope.
A man raises a box of mass 50 kg to a height of 2 m in 20 s, while another man raises the same box to the same height in 50 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1
