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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. |
संबंधित प्रश्न
A ball is placed on a compressed spring. What form of energy does the spring possess? On releasing the spring, the ball flies away. Give a reason.
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?
State whether the object possess kinetic energy, potential energy, or both :
A man climbing a hill _____________.
What kind of energy is possessed by the following?
A compressed spring ____________.
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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)
Define the term 'energy' of a body. What is the SI unit of energy.
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A stone is thrown upwards as shown in the diagram. When it reaches P, which of the following has the greatest value of the stone?
Name the device or machine which convert :
Chemical energy into heat energy.
Fill in the blanks with suitable words:
When a ball is thrown upwards, ___________ energy is transformed into ___________ energy.
What kind of energy transformations take place at a coal-based thermal power station?
How much electrical energy in joules does a 100 watt lamp consume : in 1 second?
Name the energy transfers which occur when :
an electric ball rings
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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.
