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प्रश्न
What is the difference between gravitational potential energy and elastic potential energy? Give one example of a body having gravitational potential energy and another having elastic potential energy.
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उत्तर
We can differentiate between gravitational and elastic potential energy as -
| Gravitational potential energy | Elastic potential energy |
| A body possesses gravitational potential energy if it is placed any height above the ground. (ground is considered as the refence level) | A body possesses elastic potential energy if its shape is changed by squeezing, pushing or pulling. |
| Gravitational force is responsible for this energy. | Elastic property of the body is responsible for this energy. |
Example:
(i) Gravitational potential energy - A book kept on a table possesses gravitational potential energy because of its position above the ground.
(ii) Elastic potential energy - The stretched rubber string of a catapult possesses elastic potential energy because of the change in shape of the string.
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संबंधित प्रश्न
Two bodies A and B of masses 10 kg and 20 kg respectively are at the same height above the ground. Which of the two has greater potential energy?
A bucket full of water is on the first floor of your house and another identical bucket with the same quantity of water is kept on the second floor. Which of the two has greater potential energy?
Find the gravitational potential energy of 2.5 kg mass kept at a height of 15 m above the ground. The force of gravity on mass 1 kg is 10 n.
The potential energy of a body is the energy by virtue of its ______.
A spring is kept compressed by a small trolley of mass 0.5 kg lying on a smooth horizontal surface as shown in the adjacent fig. When the trolley is released, it is found to move at a speed v = 2 m s-1. What potential energy did the spring possess when compressed?
State whether the following statement is true or false :
The potential energy of a body of mass 1 kg kept at a height of 1 m is 1 J.
A weightlifter is lifting weights of mass 200 kg up to a height of 2 metres. If g = 9.8 m s−2, calculate :
work done by the weightlifter
When a ball is thrown vertically upwards, its velocity goes on decreasing. What happens to its potential energy as its velocity becomes zero?
Prove that the kinetic energy of a freely falling object on reaching the ground is nothing but the transformation of its initial potential energy.
If we increase the velocity of a car moving on a flat surface to four times its original speed, its potential energy ______.
