Key learning points

1. Energy is measured in joules (J).
2. Doubling the mass of a moving object doubles the energy it has in its kinetic store.
3. Doubling the speed of an object increases the energy it has in its kinetic store by four times.
4. The energy an object has in its kinetic store of energy is found using the equation KE = ½ mv².

Common misconception

Keywords

• Work done - Work is done whenever a force makes an object move. The amount of work done is equal to the force multiplied by distance moved in the direction of the force.

• Kinetic store - If an object is moving and has a mass, then there is energy in its kinetic store.

• Directly proportional to - If two quantities are directly proportional, then as one increases, the other also increases at the same rate.

• Kinetic energy - The energy an object has in its kinetic store is referred to as the object’s kinetic energy.