Ngā Whāinga Ako 🔗
- Be able to identify different forms of energy
- Be able to describe different forms of energy
- Be able to categorise energies
Types of Energy 🔗
- Heat
- Magnetic
- Radiant
- Sound
- Nuclear
Active vs. Potential Energy 🔗
We split these 10 types of energy into two broad categories.
Active Energy 🔗
Energy that is doing work (something that can be observed and measured).
Potential Energy 🔗
Energy that is stored some way, and can be released to do something active!
Active Energy Tauria 🔗
Kinetic, sound, radiant, heat and electrical
Potential Energy Tauria 🔗
Gravitational, nuclear, chemical, elastic and magnetic
Mahi Tuatahi 🔗
Match these types of energy and their definitions up in your book:
| Thermal | Light | Light Bulbs, a Bunsen flame | talking, TV, radio |
| Gravitational | Kinetic | hot water, a hot radiator | Nuclear bombs, power stations |
| Nuclear | Sound | Anything that is moving | Food, batteries, burning things |
| Elastic | Electrical | book on a shelf, bungee jumper | a wind-up-toy, rubber band |
| Computer | Chemical |
Energy Circus 🔗
Move around the room and see how each toy works. Write down the types of energy involved in each object!
Conservation of Energy 🔗
The Law of Energy Conservation is true throughout the universe. We have never found a situation where it doesn’t apply!
$$ \begin{aligned} \text{Energy in} &= \text{Energy out} \end{aligned} $$
Energy cannot be created or destroyed, only transformed from one type to another.
Whakamātau Whakaaro / Thought Experiment 🔗
Consider a skydiver falling to Earth.
- What kind of energy do they have before they jump out of the plane? Active or potential?
- What about after they start falling?
Discuss with the person and then write your answers in your book.
Whakatika 🔗
- When they are about to jump out of the plane they have gravitational potential energy.
- When they are falling they have both gravitational potential and kinetic energy.
Tauria 🔗
- Chemical energy in food is transformed to heat energy and kinetic energy by our bodies
- Gravitational energy in a ball is converted to kinetic energy when it falls to the ground
What energy transformations are happening at the boxes?
- Chemical potential energy in the battery is transformed into electrical energy moving along the earphones wire
- Electrical energy in the wire causes the earphone unit to move transforming it into sound energy