First slide

Kinetic energy

Question

Which of the following is correct?

Easy

A

The kinetic energy of a system can be changed without changing the momentum
B

The kinetic energy of a system cannot be changed without changing the momentum
C

The momentum of a system cannot be changed without changing its kinetic energy.
D

A system cannot have energy without having momentum

Solution

The kinetic energy of a system can be changed without changing the momentum. An explosion of a bomb is a good example of this phenomena. When a bomb explodes, kinetic energy is greatly increased but the momentum is conserved. This can be proved using vector algebra, by taking the vector sum of the velocities of all the particles in the explosion.

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