IGCSE Physics: Impulse and Safety Features | Edexcel Modular | Unit 1 | L17

IGCSE Physics: Impulse and Safety Features | Edexcel Modular | Unit 1 | L17

This lesson covers spec points 1.26P, 1.28P and 1.29P — using momentum to explain safety features, using F = Δp / t, and demonstrating understanding of Newton’s Third Law. Physics only.

PowerPoint includes:
• Retrieval starter reviewing conservation of momentum from L16
• Direct Instruction (I Do) — F = Δp / t introduced and linked to F = ma; impulse defined as change in momentum; key principle: same Δp over a longer time = smaller force; safety features analysed using F = Δp / t (crumple zones, airbags, seatbelts, crash helmets); Newton’s Third Law stated with key features of force pairs; real-world examples (rocket propulsion, swimming, collisions)
• Guided Practice (We Do) — F = Δp / t calculation; explain how a crumple zone reduces force on passengers; identify a Newton’s Third Law pair from a scenario and explain why they qualify as a pair
• Independent Practice (You Do) — F = Δp / t calculations; extended safety feature explanations; Newton’s Third Law pair identification and justification
• Review and Reflect — 3 MCQs and exit ticket

Activity Sheet includes:
• Formula box: F = (mv − mu) / t
• 10 exam-style questions covering impulse calculations, safety feature explanations using F = Δp / t, and Newton’s Third Law
• Stretch question requiring students to calculate the force in a collision, evaluate the most effective safety feature, and identify the Newton’s Third Law pair acting during the impact
• Full mark scheme for teacher use