Neptune moves in a circular orbit around the Sun. At point P, Neptune's direction of travel is due north and the Sun is due east of P. Four positions are the same distance from P: W is due north, X is north-east, Y is due east and Z is due west.
From the instant Neptune reaches P, the Sun stops exerting a gravitational force on Neptune. No other force acts on Neptune. Which position would Neptune pass through next?
Neptune would next pass through position W.
Neptune would next pass through position Y.
Neptune would next pass through position Z.
Neptune would next pass through position X.
84 exam-style questions on AQA GCSE Physics 8.1 Solar system; stability of orbital motions; satellites, covering 8.1.1 Our solar system, 8.1.2 The life cycle of a star, and 8.1.3 Orbital motion, natural and artificial satellites. Each one has a worked solution and a mark scheme showing where the marks go.