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Newton's third law
Identify action–reaction force pairs and explain why they never cancel, using rockets, swimming and collisions.
⏱ 17 min❓ 8 questions
What you'll be able to do
- ✔I can state Newton's third law and identify action–reaction force pairs
- ✔I can explain why third-law pairs act on different objects and do not cancel
- ✔I can combine the third and second laws to compare the accelerations of interacting objects
How this works
- 1Read the short explanations first — they teach you what you need before each question.
- 2Answer each question, then tap Check. A right answer moves you on automatically; if it's wrong, you'll see a friendly explanation of why.
- 3Finish all 3 steps to see your score — sign in and subscribe to unlock the full lesson and save it.
What's inside
8 questions and 1 quick teaching card, including:
- 🔘Multiple choice — Tap the answer you think is best, then check it.
👪Grown-up tip: sit alongside younger learners for the first few lessons. Read the questions together and chat about the explanations — that's where the real learning sticks.
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Curriculum: AC9S10U05