A-LevelPhysicsForces, density and pressure9702/12 · Oct/Nov 2023 · Q41 Mark
An aeroplane is moving at a constant speed in a straight line at an angle θ to the horizontal. Four forces act on the aeroplane: thrust force T, weight W, lift force L and resistive force R. [Figure 4.1] Which two equations must be correct?
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.
AL = W cos θ and T = R + W sin θ
BL = W sin θ and T = R + W cos θ
CL = W cos θ and T = R – W sin θ
DL = W sin θ and T = R – W cos θ
✓ Correct answer
A: L = W cos θ and T = R + W sin θ
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