This key facts covers Understanding Impulse 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 2 of 7 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 7
Practice
13 questions
Recall
10 flashcards
📚 Understanding Impulse
Definition: Impulse is the change in momentum of an object, which equals force × time.
Key relationships:
- Impulse = Force × time (F × t) — measured in N s
- Impulse = Change in momentum (Δp = mΔv) — measured in kg m/s
- 1 N s = 1 kg m/s (same unit, different names)
The crucial insight:
- For a given momentum change, increasing time decreases force
- F = Δp / t → longer time = smaller force
- This is why safety features work!
Keep building this topic
Read this section alongside the surrounding pages in Impulse & Collisions. That gives you the full topic sequence instead of a single isolated revision point.
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.
Quick Recall Flashcards
13 questions on Impulse & Collisions — practise free
Instant marking, adaptive difficulty, and 10 spaced repetition flashcards. Free until your GCSEs.
Try PrepWise Free