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Student Book answers of energy P1.4 Gravitational potential energy stores Question number Answer Marks Guidance 1 a descent: GPE of ball transferred by force of gravity → KE of ball, + KE of air pushed aside by ball moving, impact: KE of ball → elastic energy of ball + some elastic energy → KE as it rebounds,
Student Book answers . Collins GCSE Science © HarperCollins. Publishers. Limited 2016. Chapter 1: Energy . Lesson 1.1 Potential energy 1 . You would feel that the force needed to stretch the rubber band increases, the more you stretch it. 2. As you turn the key, you stretch the spring more. This means that the energy stored increases. 3
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Level 1: A simple response is made where it is recognised that the mass and the volume duck need to be measured. (1-2 marks) Latent heat of fusion of water is the energy needed to melt 1 kg of ice into water (or the energy given out when 1 kg of water freezes into ice). [1 mark. Indicative content.
Student Book answers . Collins GCSE Science © HarperCollins. Publishers. Limited 2016. Chapter 6: Waves . Lesson 6.1 Describing Waves 1. 2 waves . 2. As the amplitude increases, the amount of energy transferred by a wave increases. 3a. f = 1 / T = 1 / 0.1 = 10 Hz . 3b. f = 1 / T = 1 / 0.25 = 4 Hz . 4. v = fλ = 2 Hz × 0.1 m = 0.2 m/s . 5
