Advertisements
Advertisements
प्रश्न
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.
Advertisements
उत्तर
Positive work is done.
Explanation:
When a car in neutral gear is coming down the slope, the direction of displacement covered by it is parallel to the direction of force of gravity (downwards), so the work done on the car by the force of gravity is positive.
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.)
State and define the S.I. unit of work.
State two factors on which power spent by a source depends. Explain your answer with examples.
Name two places in india where electricity is generated from nuclear power plants.
State two conditions for work to be done.
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person walks on a levelled road.
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person climbs a ladder.
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).
