SP9a Objects Affecting Each Other | Edexcel GCSE Physics Topic Mastery Pack

A focused three-component revision and exam practice pack for SP9a, covering the complete Edexcel Separate Science Physics specification for contact and non-contact forces, force fields, action–reaction pairs, and vectors vs scalars (P9.1a–c, P9.2).

Topic Mastery Sheet covers the three types of non-contact force (gravitational, electrostatic, magnetic) with their respective fields and the key property that each field weakens with distance; the two categories of contact force (normal contact force and friction/drag) with the distinction between them; action–reaction force pairs developed through Newton’s Third Law - the four defining properties (equal magnitude, opposite direction, same force type, acting on different objects) - with a worked example using a book on a table; and the vector/scalar distinction with full example lists. The most common misconception - that action–reaction pairs are the same as balanced forces - is addressed directly with a clear comparison.

Student Exam Practice Sheet includes a four-row contact/non-contact table to complete; a two-part question on the Moon’s orbit identifying the force and the field through which it acts; a scalar/vector MCQ followed by a naming question and a three-mark explanation of why constant speed does not mean constant velocity; and a four-mark question requiring students to describe two complete action–reaction pairs for a book on a table, including force types and the objects involved. Question format matches the Edexcel test style.

Teacher Answer Key provides a complete mark scheme with examiner notes specifying that “gravity” alone is not accepted for weight in a free body context; that the velocity explanation requires both the fact that direction changes and the reason (velocity is a vector) for both marks; and that action–reaction pair marks require forces to be clearly on different objects to earn credit.

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