Specification references covered: P2.15, P2.19, P2.22 (F = ma; trolley investigation; fair test control variables; inertial mass; aircraft calculation)

The Topic Mastery Sheet gives the trolley calculation with the conversion mark flagged explicitly. The Higher aircraft section reproduces all four marks: resultant vertical force 2500 N; mass 1500 kg; a = 1.7 m/s². The fair test control variables and safety precautions for the trolley investigation (P2.19) are given in mark-scheme format.

The Student Exam Practice Sheet (20 marks) includes: trolley investigation fair test and safety; trolley calculation; F = ma equation with definitions; car force calculation; truck acceleration (ECF); Higher aircraft horizontal and vertical analysis; and Higher inertial mass definition.

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