SP7b Gravity and Orbits | Edexcel GCSE Physics Separate Science Topic Mastery Pack

A focused three-component revision and exam practice pack for SP7b, covering the complete Edexcel Separate Science Physics specification for gravity, weight, and orbital mechanics (P7.1P, P7.5P–P7.7P).

Topic Mastery Sheet covers the W = mg equation with a worked example contrasting weight on Earth and on the Moon; the two surface factors (mass and radius) that determine gravitational field strength; orbit shapes, periods, speeds, and central bodies for planets, moons, comets, and artificial satellites; the side-by-side comparison of comet and moon orbits that the exam regularly tests; and the distinction between speed (constant in a circular orbit) and velocity (continuously changing because it is a vector). Higher-tier content explains, step by step, why increasing a satellite’s speed moves it to a higher orbit where it ultimately travels more slowly - a result that is counterintuitive but reliably tested at Higher.

Student Exam Practice Sheet includes two weight-calculation questions using W = mg with a conceptual follow-up on why mass and weight differ; a two-part satellite comparison question on gravitational pull and orbital speed; a four-mark compare-and-contrast on comet versus moon orbits requiring both similarities and differences; and a three-mark Higher question on the effect of a speed increase on orbital radius and final stable speed. Question format matches the Edexcel test style.

Teacher Answer Key provides a complete mark scheme with examiner notes, including guidance that “velocity changes because direction changes” requires both points to earn both marks, and that the Higher orbital question requires reference to gravity decelerating the satellite as it rises.

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