Advertisements
Advertisements
Question
A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?
Advertisements
Solution
When a freely falling body eventually stops on reaching the ground, its kinetic energy appears in the form of:
- Collisions cause the body and earth to warm up.
- Sound is created when the body crashes with the earth.
- Potential energy of earth and human body structure. The ground might be depressed where the collision occurs and the body might be twisted. Dissipation of energy is the process whereby the kinetic energy of a freely falling body is lost in an unproductive cycle of energy changes.
APPEARS IN
RELATED QUESTIONS
Define the term kinetic energy. Give one example of a body which possesses kinetic energy.
State two factors on which the kinetic energy of a moving body depends.
Two bodies of equal masses are moving with uniform velocities v and 2v. Find the ratio of their kinetic energies.
A body of mass 60 kg has the momentum 3000 kg m s-1. Calculate:
- the kinetic energy.
- the speed of the body.
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 horse and a dog are running with the same speed. If the weight of the horse is ten times that of the dog, What is the ration of their kinetic energies?
What is energy of motion? Give examples.
When the speed of a moving object is doubled, then its kenetic energy ______.
The kinetic energy of a given body depends on the ______.
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.
