📚 Year 7 CAIE Physics: Key Points for Experimental and Practical Assessments | 实验与实践考核要点
Experiments and practical skills lie at the heart of Year 7 CAIE Physics. To succeed in practical assessments, you need to master not only the scientific concepts but also how to plan, carry out, and record investigations safely and accurately. This guide covers the essential skills you will be tested on, from using common laboratory equipment to analysing data and drawing conclusions.
实验与实践技能是 CAIE 七年级物理的核心内容。要在实践考核中取得好成绩，你不仅要掌握科学概念，还要学会如何安全、准确地规划、实施和记录探究活动。本指南涵盖你将会被考查的关键技能，包括使用常用实验室设备、分析数据以及得出实验结论。
1. Safety in the Laboratory | 实验室安全
Always follow your teacher's instructions and the safety rules for each experiment. Wear safety goggles when heating substances or handling acids. Tie back long hair, tuck in loose clothing, and never eat or drink in the lab. Know the location of the fire extinguisher, fire blanket, and eye-wash station.
务必遵守老师的指导和每项实验的安全规则。加热物质或处理酸时要佩戴护目镜。将长发扎起，塞好宽松衣物，绝不在实验室饮食。了解灭火器、灭火毯和洗眼器的位置。
2. Using Measuring Instruments | 使用测量仪器
In Year 7 physics, you will use a ruler, metre stick, measuring cylinder, top-pan balance, spring balance, thermometer, and stopwatch. Always check that the instrument is set to zero before measuring. Read the scale at eye level to avoid parallax error. Record the reading with the correct unit.
在七年级物理中，你会用到直尺、米尺、量筒、托盘天平、弹簧秤、温度计和停表。测量前务必检查仪器是否归零。读数时视线与刻度齐平以避免视差。记录读数时要带上正确的单位。
3. Measuring Length Accurately | 精确测量长度
Use a ruler or metre stick with the zero mark aligned at the very edge of the object. Place your eye directly above the mark to avoid parallax. For curved lengths, use a piece of string, then measure the string against the ruler. Record the length in millimetres (mm) or centimetres (cm).
使用直尺或米尺时，将零刻度对准物体的起始边缘。眼睛正对刻度线以避免视差。测量弯曲长度时，可以用一段绳子贴合，然后拉直用尺子测量。记录长度时使用毫米(mm)或厘米(cm)。
4. Measuring Mass and Volume | 测量质量与体积
To measure mass, place the object on a top-pan balance and read the display in grams (g) or kilograms (kg). For liquids, place an empty beaker on the balance, press 'tare' or zero, then pour in the liquid. To measure volume of a liquid, use a measuring cylinder and read the bottom of the meniscus at eye level. For an irregular solid, measure the volume of water displaced in a measuring cylinder.
测量质量时，将物体放在托盘天平上，读取克(g)或千克(kg)的显示值。测量液体质量，可先放空烧杯归零，再倒入液体。测量液体体积时，使用量筒并在视线水平处读取凹液面底部。对于形状不规则固体，可测量它在量筒中排开水的体积。
5. Measuring Temperature and Time | 测量温度与时间
When using a thermometer, immerse the bulb fully in the substance but do not let it touch the container wall. Wait for the reading to stabilize before recording in degrees Celsius (°C). For a stopwatch, start timing when the event begins and stop precisely at the end. Record time in seconds (s) or minutes and seconds.
使用温度计时，将感温泡完全浸入被测物中，但不要碰到容器壁。等待读数稳定后再记录，单位为摄氏度(°C)。使用停表时，在事件开始时启动，在结束时准确停止。记录时间用秒(s)或分钟和秒。
6. Recording Data in Tables | 用表格记录数据
Draw a neat results table with columns for each variable. Headings must include the quantity and its unit, e.g. 'Time (s)' or 'Temperature (°C)'. Enter raw data clearly and consistently. If you repeat measurements, add extra columns for each trial. Never erase original readings; cross out mistakes with a single line and keep them visible.
画一个整洁的结果表格，为每个变量设置一列。表头必须包含物理量和单位，例如“时间(s)”或“温度(°C)”。清晰、一致地填入原始数据。如果重复测量，可为每次试验增设列。绝不要擦除原始读数；用单线划去错误并保持可见。
7. Drawing Simple Graphs | 绘制简单图表
In Year 7, you will draw bar charts for discrete categories or line graphs for continuous data. Plot the independent variable on the horizontal axis (x-axis) and the dependent variable on the vertical axis (y-axis). Label each axis with the quantity and unit, use sensible scales, and give the graph a title. Plot points with small crosses and draw a smooth line of best fit if appropriate.
在七年级，你将绘制类别数据的条形图或连续数据的折线图。将自变量放在横轴(x轴)，因变量放在纵轴(y轴)。每个坐标轴标注物理量和单位，使用合理的刻度，并给图表添加标题。用“x”号标出数据点，若合适则画一条光滑的最佳拟合线。
8. Identifying Variables | 识别变量
Every experiment has an independent variable (what you change), a dependent variable (what you measure), and control variables (what you keep the same). For example, when investigating how the length of a pendulum affects its period, length is the independent variable, period is the dependent variable, and the mass and release angle are controls.
每项实验都有自变量（你改变的）、因变量（你测量的）和控制变量（你保持不变的）。例如，在研究摆长对周期的影响时，摆长是自变量，周期是因变量，摆球质量和释放角度是控制变量。
9. Ensuring a Fair Test | 确保公平测试
A fair test means you change only one variable at a time while keeping all other conditions the same. This allows you to see the true effect of the independent variable. In a plant growth experiment, you would use the same amount of water, same type of soil, and same light conditions – only changing the amount of fertiliser.
公平测试意味着每次只改变一个变量，而保持其他所有条件相同。这样才能看清自变量的真实影响。在植物生长实验中，你会使用相同的水量、相同的土壤类型和光照条件——只改变施肥量。
10. Taking Repeat Readings and Calculating Averages | 重复测量与计算平均值
Always take at least two repeat readings for accuracy and reliability. Calculate the mean by adding all readings and dividing by the number of readings. Exclude any obvious anomalous results before averaging. Averages reduce the effect of random errors and make your data more trustworthy.
为获得准确可靠的结果，至少要取两次重复读数。计算平均值时，将所有读数相加再除以读数次数。求平均值前要排除明显的异常值。平均值能减小随机误差的影响，让你的数据更加可信。
11. Identifying Anomalies and Errors | 识别异常值与误差
An anomalous result is a reading that does not fit the pattern of the other data. You should check for possible mistakes in measurement or recording. Random errors cause readings to scatter around the true value and can be reduced by averaging. Systematic errors, such as a zero error on a balance, shift all readings in the same direction.
异常值是不符合其他数据规律的读数。应检查是否在测量或记录时有误。随机误差使读数分散在真值周围，可通过求平均值减小。系统误差（如天平未归零）会使所有读数向同一方向偏移。
12. Writing a Conclusion | 撰写结论
A well-written conclusion states what you found out and refers to the data you collected. For example, 'The period of the pendulum increased as the length increased. The average period for 50 cm length was 1.42 s, whereas for 100 cm length it was 2.00 s.' Always link your conclusion back to the aim and discuss whether it was a fair test.
一份好的结论要说明你的发现并引用收集到的数据。例如：“摆的周期随摆长增加而增加。50 cm摆长的平均周期为1.42 s，而100 cm摆长的平均周期为2.00 s。”结论始终要与实验目的相呼应，并讨论实验是否公平。
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