0.7 · Preface · Forces and motion overview
What makes things move?
Unbalanced forces and the four fundamental forces.
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A block sits still on a level table. Tilt the table and it slides. Nothing was added. What changed?
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When does an object's motion change?
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Which force holds the nucleus together?
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Gravity acts between…
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A cup slides off a tilted tray. Use forces to explain why it moves.
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Remember earlier lessons
From lesson 0.3
Which is a base unit?
From lesson 0.2
A vector needs…
Summary card
Key points
- • Unbalanced forces change motion.
- • There are four fundamental forces.
- • Bigger imbalance, more rapid change.
Key terms
- Force :
- a push or a pull
- Unbalanced :
- the forces do not cancel
Common errors
- • Thinking constant speed needs a force.
- • Forgetting friction.
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