AS Physics Paper 1 Experimental Investigation: Lessons from the January 2018 Mark Scheme | AS物理试卷1实验探究：2018年1月评分标准的启示

📚 AS Physics Paper 1 Experimental Investigation: Lessons from the January 2018 Mark Scheme | AS物理试卷1实验探究：2018年1月评分标准的启示

Understanding how to approach experimental questions is crucial for success in AS Physics. The January 2018 Paper 1 mark scheme provides a clear blueprint of what examiners expect from candidates when they plan, carry out, and evaluate an investigation. This article will analyse the key skills and marking points from that paper, giving you a strategic guide to scoring full marks in the experimental section.

理解如何应对实验题对AS物理的成功至关重要。2018年1月试卷1的评分标准清楚地展示了考官在考生规划、实施和评估实验时所期望的答案要点。本文将分析该试卷中的关键技能和评分点，为你提供一份在实验部分取得满分的策略指南。

1. Interpreting the Experimental Scenario | 解读实验情景

In the January 2018 paper, candidates were presented with an investigation involving a helical spring and masses. The aim was to determine the spring constant and explore the relationship between force and extension. The mark scheme rewarded precise reading of the scenario, identifying what was to be measured and what graph would be needed.

在2018年1月的试卷中，考生需完成一项关于螺旋弹簧和砝码的实验。目标是确定弹簧的劲度系数并探索力与伸长量的关系。评分标准要求精准解读情景，明确需要测量什么以及将绘制何种图像。

2. Identifying Independent, Dependent and Control Variables | 确定自变量、因变量和控制变量

Examiners expect a clear statement of variables. The independent variable was the force applied (mass x g), the dependent variable was the extension of the spring, and the control variables included the temperature and the spring’s original length. The mark scheme awarded marks for stating these explicitly.

考官期待考生清晰地陈述变量。自变量是施加的力（质量x g），因变量是弹簧的伸长量，控制变量包括温度和弹簧原长。评分标准对明确陈述这些变量给予分数。

A common error was to confuse extension with stretched length. The scheme penalised candidates who failed to realise that extension = stretched length – original length. Always define how you calculate the dependent variable.

常见的错误是将伸长量与拉伸后的长度混淆。评分方案对未能认识到伸长量 = 拉伸长度 – 原长的考生予以扣分。务必定义如何计算因变量。

3. Designing a Method and Choosing Apparatus | 设计方法并选择仪器

To measure the extension, a ruler (mm scale) was acceptable, but a vernier calliper or a travelling microscope was preferred for greater precision. The mark scheme highlighted that the ruler must be positioned vertically and aligned with the spring to avoid parallax error. Masses should be added carefully to avoid overstretching.

为了测量伸长量，可以使用带有毫米刻度的直尺，但更推荐使用游标卡尺或移动显微镜以获得更高的精度。评分标准强调，直尺必须垂直放置并与弹簧对齐以避免视差。砝码应小心添加以防过度拉伸。

A step-by-step logical sequence is essential: hang the spring, measure original length, add a known mass, measure new length, repeat for at least six different masses, and ensure readings are taken only when the mass is stationary.

必须有条理的步骤：悬挂弹簧，测量原长，添加已知质量，测量新长度，至少重复六种不同质量，并确保在质量静止时才读数。

4. Recording Data and Constructing a Table | 记录数据与制作表格

The mark scheme required a neat table with headings including units, e.g., Force / N, Extension / mm. All raw data must be recorded to the precision of the measuring instrument. For a ruler marked in mm, lengths would be recorded to the nearest mm, e.g., 245 mm rather than 24.5 cm.

评分标准要求一个整洁的表格，表头包含单位，例如 力 / N，伸长量 / mm。所有原始数据必须记录到测量仪器的精度。对于以毫米分度的直尺，长度应记录到最近的毫米，例如245 mm而不是24.5 cm。

Calculated values like Force should use g = 9.81 m s⁻² and be given to an appropriate number of significant figures. The mark scheme often rewards consistency in s.f.

计算值如力应使用 g = 9.81 m s⁻² 并给出适当的有效数字。评分标准通常对有效数字的一致性给予奖励。

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