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प्रश्न
What is the difference between potential energy and kinetic energy?
State two differences between potential energy and kinetic energy.
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उत्तर
| Potential Energy | Kinetic Energy |
| It is the energy of a body by virtue of its change in shape, size or configuration. | It is the energy of a body by virtue of its motion. |
| It is independent on the speed of the body. | It is directly proportional to the square of the speed of the moving body. |
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संबंधित प्रश्न
Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when
- The body is at the top.
- the body has fallen a distance x.
- the body has reached the ground.
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. Taking g = 10 m s−2, calculate:
- the potential energy possessed by the ball when it is initially at rest.
- the kinetic energy of the ball just before it hits the ground?
Is energy a vector quantity?
What kind of energy is possessed by the following?
Water stored in the reservoir of a dam __________.
What type of energy is possessed : by the stretched rubber strings of a catapult?
A boy weighing 40 kg makes a high jump of 1.5 m.
What is his potential energy at the highest point? (g = 10 m/s2)
What are the various forms of energy?
Name the device which converts electrical energy into mechanical energy.
Name the device or machine which convert :
Electrical energy into light energy.
Name the device or machine which convert :
Electrical energy into sound energy.
Name the device or machine which convert :
Chemical energy into kinetic energy (or mechanical energy).
Name the device or machine which convert :
Chemical energy into heat energy.
Fill in the blanks with suitable words :
The principle of ___________ of energy says energy can be transformed from one form to another, but it cannot be ___________ or ___________.
What is the meaning of the symbol kWh? What quantity does it represent?
How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes?
Name the energy transfers which occur when :
someone speaks into a microphone
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What is the potential energy of ball at B?
The device which converts mechanical energy into energy which runs our microwave oven is :
An automobile engine propels a 1000 kg car (A) along a levelled road at a speed of 36 km h–1. Find the power if the opposing frictional force is 100 N. Now, suppose after travelling a distance of 200 m, this car collides with another stationary car (B) of the same mass and comes to rest. Let its engine also stop at the same time. Now the car (B) starts moving on the same level road without getting its engine started. Find the speed of the car (B) just after the collision.
A girl with having a mass of 35 kg sits on a trolley of mass 5 kg. The trolley is given an initial velocity of 4 m s–1 by applying a force. The trolley comes to rest after traversing a distance of 16 m. (a) How much work is done on the trolley? (b) How much work is done by the girl?
