This exam focus covers Exam Focus — Impulse and Collisions within Impulse & Collisions for GCSE Physics. Revise Impulse & Collisions in Forces for GCSE Physics with 13 exam-style questions and 10 flashcards. Use this page as part of a wider topic revision path rather than treating it as an isolated fact. It is section 4 of 7 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
🎯 Exam Focus — Impulse and Collisions
Frequently Examined
Impulse is examined on Edexcel 1PH0/1 (Paper 1, Higher tier — 1PH0/1H). Edexcel presents this topic through real-world safety scenarios ("A car travelling at 12 m/s is brought to rest in 0.8 s…") and asks students to apply F = Δp/t. Key question types:
- Calculate impulse — use F × t = Δp; show both the momentum change and the impulse value
- Calculate average force from impulse — rearrange to F = Δp/t, link to safety features
- Explain why safety features reduce injury — increasing time of impact reduces force for the same momentum change
- Elastic vs inelastic collision distinction — state which quantity is conserved in each
- Force-time graph questions — area under graph = impulse; interpret shape of graph
Edexcel style note: Edexcel frequently uses "Suggest" command word for novel safety scenarios — apply the same impulse principle even if the context is unfamiliar (helmet, airbag, crumple zone, catching a ball).
Practice questions for Impulse & Collisions
Which equation correctly defines impulse?
Explain how an airbag reduces the risk of injury to a driver in a collision.