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प्रश्न
Explain the types of mechanical energy.
Define the two forms of mechanical energy and give examples.
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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: The energy possessed by a moving object is known as kinetic energy. It is also known as the energy of motion.
Examples: Moving car, a cricket ball bowled by a player, and a bullet coming out of a gun. - Potential energy: The energy possessed by an object that is at rest is known as potential energy. It is also known as the stored energy of position.
Examples: Objects lifted above, stone in the stretched rubber, and water in the dam.
संबंधित प्रश्न
An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.
Kinetic energy = 1/2 × mass × ............
When a boy doubles his speed, his kinetic energy becomes
Define the term kinetic energy. Give one example of a body which possesses kinetic energy.
The kinetic energy of a body is the energy by virtue of its ______.
A cannon ball of mass 500 g is fired with a speed of 15 m s-1. Find:
- its kinetic energy.
- its momentum.
How much work is needed to be done on a ball of mass 50 g to give it a momentum of 5 kg cm s-1?
If the speed of a body is halved, what will be the change in its kinetic energy?
How fast should a man of 50 kg run so that his kinetic energy be 625 J?
Find the momentum of a body of mass 100 g having a kinetic energy of 20 J.
What do you understand by the kinetic energy of a body?
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 :
The momentum of a bullet of mass 20 g fired from a gun is 10 kg.m/s. The kinetic energy of this bullet in kJ will be :
Which of the following does not posses the ability to do work not because of motion?
Find out the form of energy possessed by the following thing.
A rolling ball
Find out the form of energy possessed by the following thing.
Water falls
An apple falling from a tree is an example for kinetic energy.
What are the uses of mechanical energy?
What is energy of motion? Give examples.
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.
