A-LevelPhysicsPhysical quantities and units9702/12 · May/June 2018 · Q21 Mark

The drag coefficient Cd is a number with no units. It is used to compare the drag on different cars at different speeds. Cd is given by the equation Cd = (2F)/(vⁿρA) where F is the drag force on the car, ρ is the density of the air, A is the cross-sectional area of the car and v is the speed of the car. What is the value of n?

✓ Correct answer

B: 2

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Topic: Physical quantities and units, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2018 Paper 1 Variant 2, question 2.

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