Specification references covered: P2.23 (Newton’s Third Law; action-reaction pairs; equilibrium; (H) collision interactions; conservation of momentum)

The most reliably penalised error in this subtopic is confusing action-reaction pairs with balanced forces - and this pack addresses it directly with a four-column comparison table and two clearly labelled examples for the cat scenario.

The Topic Mastery Sheet gives the four properties of action-reaction pairs, the official MCQ answers (D for balancing force; B for reaction pair), and the critical distinction: “pull by cat on Earth” is the reaction to the cat’s weight, not “push by table on cat.” The Higher momentum conservation in collisions section includes a worked ice skaters calculation.

The Student Exam Practice Sheet (20 marks) includes: Newton’s Third Law statement; four properties; cat reaction pair; rocket thrust explanation; action-reaction vs balanced forces distinction; action-reaction “cancel out” misconception; everyday example; Higher ice skaters momentum calculation; and speed comparison explanation.

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