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# Unit 2: Types of interactions

400 possible mastery points

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## About this unit

Force fields sounds like science fiction, but they are a part of everyday life. In fact, they're what keep your lights on, your papers magnetically attached to your fridge, and you from floating off into outer space. Learn about electromagnetism, gravity, and how forces can be modeled using vector fields.

If it's massive, then it's attractive.

### Learn

### Practice

- Understand: Newton’s law of universal gravitationGet 3 of 4 questions to level up!
- Apply: Newton’s law of universal gravitationGet 3 of 4 questions to level up!

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

So that's why long-distance relationships are so complicated.

### Practice

- Understand: Coulomb's lawGet 3 of 4 questions to level up!

If we can't see electric or magnetic fields, how can we measure them?

### Learn

### Practice

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

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

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Level up on all the skills in this unit and collect up to 400 Mastery points!