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प्रश्न
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person climbs a ladder.
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उत्तर
Negative work is done.
Explanation:
When a person climbs a ladder (upward), the displacement covered by the person is opposite to the direction of the force of gravity (downward), so the work done on the person by the force of gravity is negative.
संबंधित प्रश्न
A stone of mass m is rotated in a circular path with a uniform speed by tying a strong string with the help of your hand. Answer the following questions
1) Is the stone moving with a uniform or variable speed?
2) Is the stone moving with a uniform acceleration? In which direction does the acceleration act?
3) What kind of force acts on the hand and state its direction?
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?
A coolie X Carrying a load on his head climbs up a slope and another coolie Y carrying the identical load on his head move the same distance on a frictionless horizontal platform. Who does more work? Explain the reason.
How is kilowatt hour related to joule?
One horse power is equal to ______.
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?
What is the work done by the gravitational force on the moon that revolves around the earth?
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.
Justify the statement. “Power can be expressed as the product of force and velocity.”
