A focused three-component revision and exam practice pack for SP11a, covering the complete Edexcel Separate Science Physics specification for charging by friction, the rules of attraction and repulsion, and charging by induction (P11.1P–P11.4P).

Topic Mastery Sheet opens with the fundamental distinction that it is always electrons - never protons - that are transferred when objects become charged, developed from the structure of the atom (protons are locked in nuclei; only outer electrons can be transferred by friction). The mechanism of charging by friction is explained with worked examples for both polythene (gains electrons from duster → negative) and acetate (loses electrons to duster → positive), with the key principle that total charge is always conserved. The difference between conductors and insulators is explained in terms of why static charge only builds up on insulators - in conductors, charge flows away to earth through the person’s body. The rules of attraction and repulsion are stated and linked to the atomic model. Induction is developed step by step using three worked examples - balloon sticking to wall, charged comb picking up paper, and stream of water bending - each explained through the redistribution of electrons within the neutral object. Lightning is developed as a five-step mechanism from cloud charging through air ionisation to the discharge bolt. A lightning conductor’s mechanism is included.

Student Exam Practice Sheet includes a charging MCQ; direction-of-transfer and charge explanation; a two-mark insulator vs conductor comparison; the four-mark balloon-and-wall question matching the exact wording and mark scheme from the Higher end-of-unit exam; a three-part comb-and-paper induction question; a five-mark lightning explanation; and a two-part like/unlike charge prediction. Question format matches the Edexcel test style.

Teacher Answer Key provides a complete mark scheme including the indicative content from the official Higher mark scheme for the balloon question, specifying that both “friction” and “transfer of electrons” score separately in the first group, and that “induces an opposite charge” is specifically required.

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