IGCSE Physics: Resultant Forces and Friction | Edexcel Modular | Unit 1 | L9

IGCSE Physics: Resultant Forces and Friction | Edexcel Modular | Unit 1 | L9

This lesson covers spec points 1.15 and 1.16 — calculating the resultant force of forces acting along a line, and knowing that friction is a force that opposes motion.

PowerPoint includes:
• Retrieval starter reviewing force types and effects from L8
• Direct Instruction (I Do) — resultant force defined as the single equivalent force; forces in the same direction added; forces in opposite directions subtracted; direction of resultant identified; friction defined as opposing motion; Newton’s First Law introduced (zero resultant = constant velocity or stationary)
• Guided Practice (We Do) — calculate three resultant forces from force pairs; identify direction of resultant and predict motion; explain the role of friction in each scenario
• Independent Practice (You Do) — resultant force calculations; free body diagram interpretation; friction in real-world contexts; Newton’s First Law application questions
• Review and Reflect — 3 MCQs and exit ticket

Activity Sheet includes:
• 10 exam-style questions on resultant force calculations, direction identification, friction and Newton’s First Law
• Free body diagram interpretation tasks
• Stretch question requiring students to identify all forces, calculate the resultant and justify the predicted motion
• Full mark scheme for teacher use