Master Topic P6 of OCR Gateway Combined Science A (J250): typical speeds, reaction time and stopping distances, car safety and collisions, energy resources, generating electricity, the national grid and transformers, and mains and domestic electricity. Worked calculations, exam tips and Mid/Stronger/Top-band model answers for the Foundation and Higher tiers. (The Solar System, the life cycle of stars and red-shift are separate-science only and are not covered.)
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