Advertisements
Advertisements
Question
Define the term kinetic energy. Give one example of a body which possesses kinetic energy.
Advertisements
Solution
- The energy of a body in motion is called its kinetic energy.
- It is defined as follows:
Kinetic energy of a body is the energy possessed by it due to its state of motion. Actually, it is the work done on the body bringing it to the state of motion. - In short form, it is written as K.E. or K.
- Example: In a swinging pendulum moving to and fro, the bob has the kinetic energy.

APPEARS IN
RELATED QUESTIONS
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?
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?
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?
A body falls freely under gravity from rest. Name the kind of energy it will possess on reaching the ground.
Write an expression for the kinetic energy of a body of mass m moving with a velocity v.
A bullet of mass 15 g has a speed of 400 m/s. What is its kinetic energy? If the bullet strikes a thick target and is brought to rest in 2 cm, calculate the average net force acting on the bullet. What happens to the kinetic energy originally in the bullet?
Derive the formula for the kinetic energy of an object of mass m, moving with velocity v.
Explain the types of mechanical energy.
The kinetic energy of a body of mass 4 kg and momentum 6 Ns will be
