Questions candidates found difficult on H2 Physics 9749 (Nov 2023) — impulse vs work, elastic collisions, fields, kinetic theory, and charged-particle paths.
Dynamics — impulse (=Ft, =Δp) versus work done (=Fs, =ΔKE)
Paper 1 Q4 — Elastic collisions: approach = separationCollisions — relative speed of approach equals relative speed of separation; speed vs velocity
Paper 1 Q5 — Projectile in a uniform fieldUniform electric field — parabolic path of a charge; where it lands on the plate
Paper 1 Q10 — Kinetic theory: apply, don’t recallKinetic theory of gases — the factor of ⅓ comes from 3D averaging, not this special case
Paper 1 Q19 — Not every field gives a circleCharged particles in fields — circular (magnetic) vs parabolic (electric) paths
Paper 1 Q25 — Crossed fields act on the same axisVelocity selector — E and B forces balance only when along the same axis
Original reconstructions inspired by the SEAB/Cambridge Examiner Report. Not actual examination questions.
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