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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, m is moving with a constant velocity, v. How much work should be done on the object in order to bring the object to rest?
Name the unit of physical quantity obtained by the formula `(2K)/v^2` Where K: kinetic energy, v: linear velocity
The energy of a flying kite is kinetic energy.
When a boy doubles his speed, his kinetic energy becomes
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 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.
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?
Two bodies have masses in the ratio 5 : 1 and their kinetic energies are in the ratio 125 : 9. Calculate the ratio of their velocities.
Write an expression for the kinetic energy of a body of mass m moving with a velocity v.
Two objects having equal masses are moving with uniform velocities of 2 m/s and 6 m/s respectively. Calculate the ratio of their kinetic energies.
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)
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 :
Derive the formula for the kinetic energy of an object of mass m, moving with velocity v.
An apple falling from a tree is an example for kinetic energy.
When stored water falls down, potential energy of water is converted into ______.
What is energy of motion? Give examples.
A body starts from rest and is acted on by a constant force. The ratio of kinetic energy gained by it in the first five seconds to that gained in the next five-second is:
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