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प्रश्न
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person walks on a levelled road.
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उत्तर
Zero work is done.
Explanation:
When a person walks on a levelled, no work is done against the force of gravity, as the displacement of the person is normal to the direction of the force of gravity, which is vertically downwards.
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 the expression for mechanical advantage of an inclined plane in terms of the length of an inclined plane.
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
Name the quality which is measured in Wh.
Is it possible that no transfer of energy may take place even when a force is applied to a body?
What do you mean by equilibrium of a body?
State the condition when the work done by a force is negative. Explain with the help of examples.
A boy takes 3 minutes to lift a 20 litre water bucket from a 20 m deep well, while his father does it in 2 minutes.
How much work each does? Take density of water = 103 kg m-3 and g = 9.8 N kg-1.
A boy weighing 50 kgf climbs up from the first floor at a height of 3 m above the ground to the third floor at a height of 9 m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg-1).
