Year 7 AQA Physics Unit Test Mock Paper Walkthrough | Year 7 AQA 物理单元测试模拟卷解析

📚 Year 7 AQA Physics Unit Test Mock Paper Walkthrough | Year 7 AQA 物理单元测试模拟卷解析

Welcome to this detailed walkthrough of a Year 7 AQA Physics unit test mock paper. We will break down common question types, highlight key concepts, and show you exactly what examiners are looking for. Use this guide to boost your confidence and avoid typical mistakes.

欢迎来到 Year 7 AQA 物理单元测试模拟卷的详细解析。我们将拆解常见题型，强调核心概念，并明确指出考官期望的答案。使用本指南来增强信心，避免典型错误。

1. Energy Stores and Transfers | 能量储存与转移

In the mock paper, a question asks: ‘A hairdryer transfers electrical energy into which other energy stores?’ Many students only mention thermal energy, but a hairdryer also produces kinetic energy (moving air) and sound energy. The correct answer includes thermal, kinetic, and sound energy. Remember that appliances often transfer energy into several stores at once.

模拟卷中有一道题问：”吹风机将电能转化为哪些其他能量储存？”许多学生只提及热能，但吹风机还产生动能（流动的空气）和声能。正确答案包括热能、动能和声能。记住，电器通常同时将能量转移到多种储存中。

Another common error involves energy diagrams. A question shows a Sankey diagram; you must calculate useful energy output. The total input is 100 J, wasted energy is 60 J, so useful energy = 100 J – 60 J = 40 J. Thus efficiency = (40 J / 100 J) × 100% = 40%. Always draw or label arrows clearly.

另一个常见错误涉及能量图。一道题给出桑基图，要求计算有用能量输出。总输入为 100 J，浪费能量为 60 J，那么有用能量 = 100 J – 60 J = 40 J。因此效率 = (40 J / 100 J) × 100% = 40%。始终清晰地绘制或标记箭头。

efficiency (%) = (useful output energy / total input energy) × 100%

效率公式强调能量既不能创造也不能消灭，只是转移。

2. Gravitational Force and Weight | 重力与重量

A typical problem asks: ‘What is the weight of a 2 kg textbook on Earth?’ Students often confuse mass and weight. Mass is measured in kilograms (kg) and is the amount of matter. Weight is a force, measured in newtons (N), and depends on gravity. Using g = 10 N/kg: weight = 2 kg × 10 N/kg = 20 N. Write the formula and show substitution.

一道典型题目问：”地球上质量为 2 kg 的课本重量是多少？”学生常混淆质量和重量。质量以千克 (kg) 为单位，是物质的多少。重量是一种力，以牛顿 (N) 为单位，取决于重力。取 g = 10 N/kg：重量 = 2 kg × 10 N/kg = 20 N。写出公式并展示代入过程。

Published by TutorHao | Year 7 Physics Revision Series | aleveler.com

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