SP9b Vector Diagrams | Edexcel GCSE Physics Topic Mastery Pack

A focused three-component revision and exam practice pack for SP9b, covering the complete Edexcel Separate Science Physics Higher tier specification for free body force diagrams, resultant forces by scale diagram, resolving forces, and equilibrium (P9.3H, P9.4H, P9.5H).

Topic Mastery Sheet covers the rules and conventions for free body force diagrams (one arrow per force, length proportional to magnitude, all forces labelled); the step-by-step parallelogram of forces method for finding a resultant from two forces at angles, with a worked example using the sled scenario from the exam (80 N at 30° and 60 N at 20° → 127 N at 9°, with tolerances stated); the reverse process of resolving a single force into two components at right angles with a table of applications; and the distinction between static and dynamic equilibrium. A worked example of the shopping trolley at constant velocity - identifying all four forces and explaining why the resultant is zero - matches the exam question type directly.

Student Exam Practice Sheet includes a three-part free body diagram question on a shopping trolley at constant velocity (diagram, plus explanation of what constant velocity implies about resultant force); a six-mark scale diagram question requiring students to draw the parallelogram for the 80 N / 60 N sled problem and read off magnitude and direction; and a six-mark Higher Level of Response question comparing the four aircraft forces in two situations (constant velocity flight vs. take-off). Question format matches the Edexcel Highertest style.

Teacher Answer Key provides a complete mark scheme with examiner notes specifying that “gravity” alone is not accepted for weight and “upthrust” is not accepted for normal contact force in a surface diagram; tolerance ranges for the scale diagram answer (120–135 N; 8°–10°); and full indicative content with level descriptors for the aircraft LoR question.

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