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प्रश्न
Explain the types of mechanical energy.
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उत्तर
The energy possessed by an object due to its position is called mechanical energy.
Mechanical energy can be classified into two;
- Kinetic energy
- Potential energy
- Kinetic energy: Energy possessed by a moving object is known as kinetic energy. It is also known as the energy of motion.
Eg: Moving car, cricket ball bowled by a player, bullet coming out of a gun. - Potential energy: Energy possessed by an object which is at rest is known as potential energy. It is also known as the store energy of position.
Eg: Objects lifted above, stone in the stretched rubber, water in the dam.
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संबंधित प्रश्न
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?
If the speed of a car is halved, how does its kinetic energy change?
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.
By how much will the kinetic energy of a body increase if its speed is doubled?
Find the momentum of a body of mass 100 g having a kinetic energy of 20 J.
A car is accelerated on a levelled road and attains a speed of 4 times its initial speed. In this process, the kinetic energy of the car :
If an object has 0 momentum, does it have kinetic energy? Explain your answer.
The energy possessed by a cricket ball bowled by a player is ______.
A ball of mass 0.5 kg slows down from a speed of 10 m s−1 to that of 6 m s−1. Calculate the change in the kinetic energy of the ball.
