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. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 2 of 4 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 4
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!