Paper 1 · Differentiation
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Lesson 20 of 21
Differentiation 20 – Rate Problems
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- Solve related-rates problems with the chain rule, e.g. dR/dt = (dR/dV)·(dV/dt)
- Use the reciprocal trick dR/dV = 1/(dV/dR) when the formula gives V in terms of R
- Eliminate a variable with similar triangles before differentiating cone problems
- Identify the given and required rates and state units (cm/s, cm²/s, cm³/s)
Most recent exam questions
- 2025 P1 Q9(a)(v)
- 2025 P1 Q9(b)(ii) — deferred
- 2024 P1 Q9(d)
- 2024 P1 Q9(e)(ii) — deferred
- 2023 P1 Q10(b) — deferred
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