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# Unit 3: Introduction to energy

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## About this unit

We know how it feels to be energetic—but what is energy exactly, and how we can investigate it? Learn about the theory of energy, the different macroscopic forms it takes, and how the forms of energy are tied together at the microscopic scale.

Energy. It's everything. Seriously.

### Practice

- Understand: introduction to energyGet 3 of 4 questions to level up!

Heat. Light. Motion. Are these all really the same thing?

### Practice

- Understand: forms of energyGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 160 Mastery points

Why do magnets feel stronger when you hold them closer together?

### Practice

- Understand: energy and fieldsGet 3 of 4 questions to level up!

We explain everything else at the microscopic level, why not energy?

### Practice

- Understand: energy at the microscopic scaleGet 3 of 4 questions to level up!
- Apply: energy at the microscopic scaleGet 3 of 4 questions to level up!

Level up on the above skills and collect up to 240 Mastery points

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Level up on all the skills in this unit and collect up to 500 Mastery points!