Newton's laws, force and momentum: Force diagrams, weight and normal reaction, F = ma and F = Δp/Δt

What this note covers

1. Where force and momentum sit in Criterion 5, and the limits that apply
2. Newton's three laws, stated the way the marker wants to read them
3. Force diagrams, weight and the normal reaction force
4. F(net) = ma: reading the question and choosing a sign convention
5. F(net) = Δp/Δt: momentum, impulse and safety contexts
6. Putting it together: multi-step force questions
7. How this topic is examined in Section B, and what separates a top answer

7 sections · 12 key terms & formulas · 6 common mistakes