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प्रश्न
Explain by an example that a body may possess energy even when it is not in motion.
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उत्तर
A body can have energy even if it is not in motion. The statement can be justified by:
Water stored in the reservoir at the roof of a building possesses gravitational potential energy due to its position above the ground.
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संबंधित प्रश्न
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?
Power spent by a body depends on the time for which it does work.
A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1.
A boy throws a rubber ball vertically upwards. What type of work, positive or negative, is done : by the force applied by the boy?
(a) by the force applied by the boy?
(b) by the gravitational force of earth?
Does the earth move around the sun with a uniform velocity?
Fill in the boxe to show the corresponding energy transformation.
State the amount of work done by an object when it moves in a circular path for one complete rotation. Give a reason to justify your answer.
A force can cause an object to change its ______.
