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
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?
A cyclist doubles his speed. How will his kinetic energy change: increase, decrease or remain same?
Write the expression for the kinetic energy of a body explaining the meaning of the symbols used.
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.
A body is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy as its velocity becomes zero?
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.
On a level road, a scooterist applies brakes to slow down from a speed of 10 m/s to 5 m/s. If the mass of the scooterist and the scooter be 150 kg, calculate the work done by the brakes. (Neglect air resistance and friction)
What is energy of motion? Give examples.
When the speed of a moving object is doubled, then its kenetic energy ______.
