A-LevelPhysicsForces, density and pressure9702/12 · May/June 2019 · Q141 Mark
A car of mass m travels at constant speed up a slope at an angle θ to the horizontal, as shown in the diagram. Air resistance and friction provide a resistive force F. The acceleration of free fall is g. [Figure 14.1] What is the force needed to propel the car at this constant speed?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Amg cos θ
Bmg sin θ
Cmg cos θ + F
Dmg sin θ + F
✓ Correct answer
D: mg sin θ + F
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