Advertisements
Advertisements
प्रश्न
Explain the difference between potential energy and kinetic energy.
उत्तर
S. No. | Potential Energy | Kinetic Energy |
1. | It is possessed by a body by virtue of its configuration and position. | It is possessed by a body by virtue of its motion. |
2. | It exists in several forms, including gravitational potential energy and electric potential energy, but work is not completed until it is converted into kinetic energy. | It only exists in one form and does not need to be converted into another in order to perform tasks. |
3. | Gravitational potential energy = mgh | Kinetic energy = `1/2 "mv"^2` |
4. | Potential energy can be negative. | Kinetic energy cannot be negative. |
5. | Eg: A book kept on a shelf has potential energy. | Eg: A moving car possesses kinetic energy. |
APPEARS IN
संबंधित प्रश्न
A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?
Name the unit of physical quantity obtained by the formula `(2K)/V^2` Where k: kinetic energy, V: Linear velocity
When a boy doubles his speed, his kinetic energy becomes
State two factors on which the kinetic energy of a moving body depends.
Two toy-cars A and Bof masses 200 g and 500 g respectively are moving with the same speed. Which of the two has greater kinetic energy?
A ball of mass M is moving with a speed v. What is its kinetic energy?
Give reasons for the following A horse and a dog are running with the same speed. Which one of them has more kinetic energy than the other.
A car is moving with a speed of 15 km h-1 and another identical car is moving with a speed of 30 km h-1. Compare their kinetic energy.
If the speed of a car is halved, how does its kinetic energy change?
Two bodies of equal masses are moving with uniform velocities v and 2v. Find the ratio of their kinetic energies.
A body of mass 10 kg is moving with a velocity 20 m s-1. If the mass of the body is doubled and its velocity is halved, find:
- the initial kinetic energy, and
- the final kinetic energy.
A body falls freely under gravity from rest. Name the kind of energy it will possess on reaching the ground.
On what factors does the kinetic energy of a body depend?
A ball of mass 200 g falls from a height of 5 metres. What is its kinetic energy when it just reaches the ground? (g = 9.8 m/s2)
A body of 2 kg falls from rest. What will be its kinetic energy during the fall at the end of 2 s? (Assume g = 10 m/s2)
A man drops a 10 kg rock from the top of a 5 m ladder. What is its speed just before it hits the ground? What is its kinetic energy when it reaches the ground? (g = 10 m/s2)
What do you understand by the kinetic energy of a body?
Find out the form of energy possessed by the following thing.
A rolling ball
The kinetic energy of a given body depends on the ______.