A-Level Physics Paper 5: Report on Exams Jun19 – Key Application Skills | A-Level物理Paper 5：2019年6月考试报告中的关键应用题技巧

📚 A-Level Physics Paper 5: Report on Exams Jun19 – Key Application Skills | A-Level物理Paper 5：2019年6月考试报告中的关键应用题技巧

In A-Level Physics Paper 5, students are required to demonstrate practical planning, data analysis, and evaluation skills. The June 2019 examiner report highlighted several common strengths and weaknesses. This article distils the key application question skills from that report, helping you approach experiment design and analysis questions with confidence.

在A-Level物理Paper 5中，学生需要展示实验规划、数据分析和评价能力。2019年6月的考官报告指出了几项常见的优点与不足。本文从该报告中提炼出关键的应用题技巧，帮助你自信地应对实验设计与分析题。

1. Understanding the Experiment Planning Question | 理解实验规划题

The first step is carefully reading the question and identifying the relationship to be investigated. Often an equation is given, e.g. T = 2π√(L/g). Your task is to design an experiment that allows you to collect data, plot a linear graph, and determine a constant such as g. Recognise that you need to linearise the equation: squaring both sides gives T² = (4π²/g)L, so plotting T² against L yields a straight line through the origin with gradient 4π²/g.

第一步是仔细阅读题目，找出要研究的关系。通常会给出一个方程，例如 T = 2π√(L/g)。你的任务是设计一个实验来收集数据，绘制线性图并确定常数（如g）。需要意识到要将方程线性化：两边平方得 T² = (4π²/g)L，因此以T²对L作图，将得到一条通过原点的直线，梯度为4π²/g。

Always identify the independent variable (what you change), the dependent variable (what you measure), and the controlled variables (what you keep constant). This is the foundation of a logical plan and helps you decide what to measure and what to control.

始终要确定自变量（你改变的量）、因变量（你测量的量）以及控制变量（你保持不变的量）。这是逻辑规划的基础，有助于你决定测量什么和控制什么。

2. Identifying Variables and Controls | 识别变量与控制

Clearly state the independent variable, for example, length L of the pendulum. The dependent variable is usually the quantity you time or measure directly, like the period T. Controlled variables could include the mass of the bob, the amplitude of swing (must be small, <10°), and the use of the same pendulum bob. Explain how you will measure the independent variable (e.g. use a metre rule to measure L from the point of suspension to the centre of the bob) and how you will keep controlled variables constant (e.g. use a protractor to ensure the initial displacement is small and consistent). The Jun19 report stressed that many students lost marks by failing to mention precise methods for controlling variables.

清楚地说明自变量，例如摆长 L。因变量通常是你计时或直接测量的量，例如周期 T。控制变量可以包括摆球质量、摆动幅度（必须很小，<10°），以及使用同一个摆球。解释你将如何测量自变量（例如使用米尺测量从悬挂点到摆球中心的长度L）以及如何保持控制变量不变（例如用量角器确保初始位移小且一致）。2019年6月的报告强调，许多学生因未提及精确的控制变量方法而丢分。

3. Designing a Detailed and Safe Procedure | 设计详细安全的步骤

The procedure should be written in a logical, step-by-step sequence. Include a labelled diagram if helpful. Key details: set up the apparatus securely, use a clamp stand to hold the string, measure the length, displace the bob by a small angle (less than 10°), release without pushing, time for a fixed number of oscillations (e.g. 20 oscillations) to reduce timing uncertainty, repeat the timing twice more and calculate an average period T. Explain the use of a fiducial marker (e.g. a vertical pin at the equilibrium point) to judge the centre of the oscillation and to avoid parallax error when starting and stopping the stopwatch. Also mention safety: ensure the clamp stand is stable, avoid large amplitudes to prevent the bob hitting objects, and be careful with falling masses.

步骤应以逻辑顺序逐步写出。如有帮助，可加入带标注的示意图。关键细节：安全地架设装置，用铁架台夹住细线，测量长度，以小角度（小于10°）拉开摆球，释放时不推，计时测量固定次数的振荡（例如20次）以减少计时不确定性，重复计时两次并计算平均周期T。解释如何使用

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