📚 KS3 CAIE Physics: Mastering Experimental and Practical Assessment | KS3 CAIE 物理：实验/实践考核要点
Practical investigations are at the heart of KS3 CAIE Physics. They build your scientific enquiry skills, from planning a fair test and taking precise measurements to analysing data and evaluating your method. Understanding what is expected in practical assessments helps you perform confidently and improve your grade.
实践探究是 KS3 CAIE 物理的核心。它们帮助你建立科学探究技能，从规划公平测试、精确测量到分析数据和评估方法。了解实践考核的要点，能让你自信地完成实验并提高成绩。
1. Safety in the Lab | 实验室安全
Always wear safety goggles to protect your eyes from chemicals, heat or flying objects.
始终佩戴护目镜，保护眼睛免受化学品、热源或飞溅物伤害。
Tie back long hair and secure loose clothing to avoid catching on equipment or flames.
将长发扎起，固定宽松衣物，防止被设备或火焰钩住。
Know the location of fire extinguishers, fire blanket, first-aid kit, and the nearest emergency exit.
了解灭火器、灭火毯、急救箱和最近紧急出口的位置。
Never taste or directly smell chemicals; waft the vapour towards your nose if necessary.
切勿品尝或直接闻化学品；必要时用手扇动气体闻味。
Report any breakages, spills or accidents to the teacher immediately.
立即向老师报告任何破碎、溅洒或事故。
Wash hands thoroughly after handling chemicals or biological materials.
在处理化学品或生物材料后彻底洗手。
2. Measuring Instruments and Units | 测量仪器与单位
In KS3 physics, you will use a range of instruments: a ruler (length), a measuring cylinder (volume), a top-pan balance (mass), a spring balance/newton meter (force), a thermometer (temperature), a stopwatch (time), an ammeter (current) and a voltmeter (voltage).
在 KS3 物理中，你将使用多种仪器：尺子（长度）、量筒（体积）、托盘天平（质量）、弹簧秤/牛顿计（力）、温度计（温度）、秒表（时间）、电流表（电流）和电压表（电压）。
Always read the scale at eye level to avoid parallax error, and record the value to the nearest scale division or estimate between divisions if appropriate.
务必平视读数以避免视差误差，记录到最接近的刻度分度，或适当估读分度之间的值。
Standard SI units are: length – metre (m), mass – kilogram (kg), time – second (s), temperature – degree Celsius (°C), force – newton (N), current – ampere (A), voltage – volt (V). Remember prefixes such as centi- (10⁻²), milli- (10⁻³) and kilo- (10³).
标准国际单位有：长度—米（m），质量—千克（kg），时间—秒（s），温度—摄氏度（°C），力—牛顿（N），电流—安培（A），电压—伏特（V）。记住词头：厘（10⁻²）、毫（10⁻³）和千（10³）。
For derived quantities, density is usually measured in g/cm³ or kg/m³, speed in m/s, and electrical resistance in ohms (Ω).
对于导出量，密度通常以 g/cm³ 或 kg/m³ 测量，速度以 m/s 计，电阻以欧姆（Ω）计。
3. Planning an Experiment | 设计实验
A clear plan should include a step-by-step method, a list of apparatus, identification of variables, and how you will make measurements safe and fair.
清晰的计划应包括逐步操作法、器材清单、变量识别以及如何确保测量安全且公平。
For example, to investigate how force affects the extension of a spring, describe: set up a clamp stand, hang a spring, attach a ruler vertically, measure initial length, add known weights, measure new length for each weight, and calculate extension (new length – original length).
例如，研究力如何影响弹簧伸长，描述：安装铁架台，悬挂弹簧，垂直固定尺，测量原长，添加已知重物，测量每次新长度，计算伸长（新长度–原长）。
Always state the independent variable (force/weight), the dependent variable (extension), and control variables (same spring, same ruler position, room temperature, etc.).
务必说明自变量（力/重量）、因变量（伸长）和控制变量（同一根弹簧、尺子位置不变、室温等）。
A risk assessment should be briefly included: e.g., place a tray under the masses in case the spring breaks, wear goggles.
应简要包含风险评估：如弹簧可能断裂，在重物下放置托盘，佩戴护目镜。
4. Controlling Variables | 控制变量
To conduct a fair test, only the independent variable should be changed; all other variables that could affect the dependent variable must be kept constant.
进行公平测试时，只能改变自变量；所有可能影响因变量的其他变量必须保持不变。
In a pendulum experiment investigating the effect of length on period, you must keep the mass of the bob the same, release from the same small angle, and use the same stopwatch operator.
在摆长对周期影响的实验中，必须保持摆锤质量相同、从相同小角度释放，并使用同一人操作秒表。
Controlled variables are sometimes called 'fixed variables'. Always list them in your plan and check that they are indeed kept unchanged.
控制变量有时称为固定变量。务必在计划中列出，并确认它们确实保持不变。
If a control is not possible, note it as a source of error or discuss its likely small effect.
如果无法控制，将其记为误差来源或讨论其可能的小影响。
5. Recording Data and Tables | 数据记录与表格
Design a table before starting the experiment. The table must have a title and column headings showing the quantity and its unit, e.g., 'Force (N)' and 'Extension (cm)'.
实验前设计表格。表格必须有标题，栏目头显示物理量和单位，如“力（N）”和“伸长（cm）”。
Record all raw data clearly. Repeat measurements at least three times for each value of the independent variable to calculate an average and reduce random error.
清晰记录所有原始数据。对自变量的
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