📚 In-depth Analysis of Past Exam Papers for Year 7 Edexcel Physics | 历年真题深度解析：Year 7 Edexcel 物理
In this article, we take a close look at real Edexcel-style exam questions for Year 7 Physics. By working through typical past paper problems, we highlight essential concepts, step-by-step solutions, and common pitfalls. This is your ultimate revision guide to boost confidence and master every topic.
在这篇文章中，我们深入分析 Year 7 Edexcel 物理的典型真题。通过拆解一道道历年风格考题，我们突出核心概念、展示解题步骤并指出常见错误。这是你建立自信、掌握每个知识点的终极复习指南。
1. Speed Calculation | 速度计算
A common question asks: “A cyclist travels 150 m in 30 seconds. Calculate her average speed. Give the correct unit.”
常见考题：”一名自行车手在30秒内行驶了150米。计算她的平均速度，并写出正确单位。”
Begin by writing the formula: average speed = distance ÷ time. Substitute the numbers: speed = 150 m ÷ 30 s.
首先写出公式：平均速度 = 距离 ÷ 时间。代入数字：速度 = 150 m ÷ 30 s。
Divide 150 by 30 to get 5. The unit comes from metres divided by seconds, so the answer is 5 m/s. Always check the unit – many students lose marks by writing just “5” or using km/h incorrectly.
用150除以30得到5。单位来自米除以秒，因此答案是5 m/s。一定要检查单位——许多学生因为只写“5”或错误地使用km/h而丢分。
A common error is forgetting that the speed must be given in m/s when distance is in metres and time is in seconds. Keep units consistent throughout.
一个常见错误是忘记当距离以米、时间以秒表示时，速度必须用m/s。始终要保持单位一致。
2. Distance-Time Graphs | 距离-时间图像
Typical exam paper shows a distance-time graph with a horizontal line followed by a straight sloping line. The question asks: “Describe the motion during the first 10 seconds and during the next 10 seconds.”
典型真题会展示一段水平线后接一条倾斜直线的距离-时间图像。问题要求：”描述前10秒和之后10秒内的运动状态。”
A horizontal line means the object is stationary – distance does not change over time. The sloping straight line indicates constant speed. The steeper the slope, the higher the speed.
水平线表示物体静止——距离不随时间改变。倾斜直线表示匀速运动。斜率越大，速度越高。
To calculate speed from the sloping section, pick two points on the line and use speed = change in distance ÷ change in time. For example, if the distance rises from 0 to 100 m in 10 s, speed = 100 ÷ 10 = 10 m/s.
要从倾斜段计算速度，在线上取两点，用速度 = 距离的变化量 ÷ 时间的变化量。例如，若距离在10秒内从0增加到100米，速度 = 100 ÷ 10 = 10 m/s。
Many students confuse a steep line with acceleration. Remember: in a distance-time graph, a straight line always shows steady speed, not acceleration. A curve would indicate changing speed.
许多学生将陡峭的直线误解为加速。记住：在距离-时间图像中，直线始终表示匀速，而不是加速。只有曲线才表示速度在变化。
3. Balanced Forces | 平衡力
Consider the question: “A book weighing 10 N rests on a table. The table pushes up with 10 N. Explain why the book remains at rest.”
来看这道题：”一本重10 N的书放在桌子上。桌子向上推的力为10 N。解释为什么书保持静止。”
The forces are balanced because the downward weight and the upward normal force are equal in size (both 10 N) and opposite in direction. The resultant force is 0 N.
这两个力是平衡的，因为向下的重力和向上的支持力大小相等（都是10 N）、方向相反。合力为0 N。
An object at rest or moving at a constant speed has balanced forces acting on it. If the forces were unbalanced, the book would accelerate in the direction of the greater force.
静止或匀速运动的物体所受的力是平衡的。如果力不平衡，书本就会朝着较大力的方向加速。
In an exam, always state that the forces are equal and opposite, and then link this to zero resultant force. Use arrows in force diagrams to show direction clearly.
在考试中，务必要说明力相等且方向相反，然后联系到合力为零。在力的示意图中用箭头清晰地表示方向。
4. Mass and Weight | 质量与重量
Paper questions often test the difference: “On Earth, g = 10 N/kg. A student has a mass of 40 kg. Calculate her weight.”
试卷常考区分：”在地球上，g = 10 N/kg。一名学生的质量为40 kg。计算她的重量。”
Weight = mass × gravitational field strength (W = m × g). Here, mass = 40 kg, g = 10 N/kg, so weight = 40 × 10 = 400 N.
重量 = 质量 × 引力场强度 (W = m × g)。这里质量 = 40 kg，g = 10 N/kg，所以重量 = 40 × 10 = 400 N。
Mass is the amount of matter and does not change; it is measured in kilograms. Weight is a force measured in newtons. Examiners expect you to use the correct units and to never say “weight is 40 kg”.
质量是物质多少，不随地点改变，单位用千克。重量是一种力，单位是牛顿。考官期望你使用正确单位，绝不能说”重量是40 kg”。
Graph questions may ask you to plot weight against mass. The slope equals g, so a straight line through the origin confirms that weight is directly proportional to mass.
图像题可能会要求绘制重量-质量图。斜率等于g，一条过原点的直线证实重量与质量成正比。
5. Density | 密度
A classic practical question: “A metal block has mass 240 g and volume 80 cm³. Find its density. What is the object likely made of?”
一道经典实验题：”一个金属块质量为240 g，体积为80 cm³。求其密度。该物体可能由什么材料制成？”
Density = mass ÷ volume (ρ = m/V). Substituting gives ρ = 240 g ÷ 80 cm³ = 3 g/cm³. This matches the density of materials like aluminium (2.7 g/cm³) or granite, so the block could be aluminium.
密度 = 质量 ÷ 体积 (ρ = m/V)。代入得 ρ = 240 g ÷ 80 cm³ = 3 g/cm³。这与铝(2.7 g/cm³)或花岗岩等材料的密度接近，因此该物体可能是铝。
If a question gives mass in kg and volume in m³, the density unit is kg/m³. Always check the units before calculating. Common mistake: using g and cm³ but giving the unit as kg/m³.
如果题目质量用kg、体积用m³，密度单位就是kg/m³。计算前一定要检查单位。常见错误：用g和cm³计算，却给出单位kg/m³。
For irregular objects, volume is found by displacement. The volume of water displaced equals the volume of the submerged object. Remember to read the meniscus at eye level.
对于不规则物体，用排水法测体积。排开水的体积等于浸没物体的体积。记得读取液面时视线要与凹液面底部相平。
6. Series Circuits | 串联电路
Exam question: “Draw a series circuit containing a cell, a switch, and two lamps. What happens to the other lamp if one lamp blows?”
考题：”画一个包含一节电池、一个开关和两盏灯的串联电路。如果一盏灯坏了，另一盏灯会怎样？”
In a series circuit, all components are connected one after another in a single loop. If one lamp blows, the filament breaks and the circuit becomes open. Current cannot flow, so both lamps go out.
串联电路中，所有元件一个接一个地连接在单一回路中。如果一盏灯坏了，灯丝断开，电路变成断路。电流无法流动，因此两盏灯都熄灭。
Parallel circuits offer alternative paths. If one lamp blows in a parallel branch, the other branch continues to work. Be ready to compare series and parallel circuits in an exam.
并联电路提供备用通路。如果并联支路中一盏灯坏了，另一条支路可以继续工作。考试中要准备对比串联和并联电路。
When drawing circuit symbols, use a ruler and the standard symbols: a circle with a cross for a lamp, two lines for a cell (long positive, short negative). Messy symbols lead to lost marks.
画电路符号时要用尺子并采用标准符号：灯泡是一个带叉的圆，电池是长短两条线（长正短负）。潦草的符号会丢分。
7. Energy Stores and Transfers | 能量储存与转移
Typical exam question: “Describe the energy transfers when a battery-powered torch is switched on.”
典型考题：”描述打开电池驱动的手电筒时发生的能量转移。”
The battery stores chemical potential energy. When the circuit is completed, this energy is transferred electrically to the lamp. The lamp then converts electrical energy into light and thermal energy.
电池储存化学势能。电路接通后，该能量通过电流转移到灯泡。灯泡随即将电能转化为光能和热能。
Use the phrase “energy is transferred from… to…” and name the stores correctly. Never say “energy is used up” – energy is conserved and only changes form.
使用”能量从……转移到……”的句式，并正确命名能量储存。绝不要说”能量被用光”——能量守恒，只会转换形式。
Diagrams often show a flow chart: chemical store → electrical pathway → thermal store (and light). Always include wasted energy, often as thermal energy that heats the surroundings.
图表常展示流程：化学储存 → 电流途径 → 热储存（以及光）。始终要包含浪费的能量，通常是以热能形式加热周围环境。
8. Sound and Hearing | 声音与听觉
Question: “Explain why astronauts cannot hear each other directly on the Moon, even though they are close together.”
问题：”解释为什么宇航员在月球上即使离得很近也无法直接听到对方说话。”
Sound is a longitudinal wave that requires a medium (solid, liquid, or gas) to travel. On the Moon there is no atmosphere – a virtual vacuum – so sound waves cannot propagate from one astronaut to another.
声音是一种需要介质（固体、液体或气体）传播的纵波。月球上没有大气层——几乎是真空——因此声波无法从一名宇航员传播到另一名宇航员。
In an exam, you must link the lack of medium to the inability of the wave to travel. Simply saying “there is no air” is not enough; explain that sound waves need particles to vibrate.
考试中必须将缺少介质与波无法传播联系起来。仅说”没有空气”不够，要解释声波需要粒子振动。
Pitch is related to frequency, loudness to amplitude. An oscilloscope trace with many waves per second shows a high pitch; a tall trace shows a loud sound.
音调与频率有关，响度与振幅有关。每秒波数很多的示波器轨迹显示高音；高大的轨迹显示响亮的声音。
9. Reflection of Light | 光的反射
Exam paper may ask: “Draw a ray diagram to show reflection from a plane mirror. Label the angle of incidence and angle of reflection.”
试卷可能要求：”绘制光线从平面镜反射的示意图，并标出入射角和反射角。”
The law of reflection states that the angle of incidence equals the angle of reflection. Both angles are measured from the normal – an imaginary line perpendicular to the mirror at the point of incidence.
反射定律指出入射角等于反射角。两个角都从法线量起——法线是在入射点处垂直于镜面的假想线。
When drawing, use a ruler and a protractor. Mark the incident ray, reflected ray, and the normal with dashed line. Clearly label angles with “i” and “r”, and show arrows on rays.
画图时要用尺子和量角器。标出入射光线、反射光线，并用虚线画出法线。清楚地用”i”和”r”标记角度，并在光线上画箭头。
A smooth mirror gives a clear reflection; a rough surface scatters light in many directions (diffuse reflection). The law of reflection still holds for each tiny part, but the normals point different ways.
光滑镜面给出清晰反射；粗糙表面使光线向各个方向散射（漫反射）。反射定律对每个微小部分依然成立，但各处法线方向不同。
10. Practical: Measuring Length | 实验：测量长度
Consider the question: “Describe how to measure the length of a table accurately using a metre ruler.”
思考这道题：”描述如何用米尺精确测量一张桌子的长度。”
Place the zero mark of the ruler exactly at one edge of the table. Look straight down at the other edge to avoid parallax error – reading from an angle can shift the apparent position of the mark.
将尺子的零刻度对准桌子的一端。从正上方观察另一端以避免视差错误——从斜角度读数会使刻度线的视位偏移。
If the table is longer than the ruler, mark where the ruler ends, then move it and add the two lengths. Record all readings in millimetres for better precision, e.g. 1500 mm instead of 1.5 m.
如果桌子比尺子长，在尺子末端处做标记，然后移动尺子并将两段长度相加。用毫米记录所有读数以提高精度，如记1500 mm而非1.5 m。
Repeat the measurement and calculate an average to reduce random errors. Common mistakes: not aligning the ruler straight, or using a broken ruler without compensating for the missing zero.
重复测量并计算平均值以减少随机误差。常见错误：尺子没有摆直，或使用零刻度已损坏的尺子却未做补偿。
11. Common Errors in Exams | 考试常见错误
Mark schemes reveal repeated mistakes. One is confusing “precision” with “accuracy”. A set of readings can be very close to each other (precise) but far from the true value (inaccurate).
评分方案揭示了重复出现的错误。其中之一是混淆”精度”和”准确度”。一组读数可能彼此非常接近（精确）却远离真实值（不准确）。
Another error is not giving a unit in numerical answers. Even if the calculation is correct, a missing unit can cost a mark. Always check the unit required in the question stem.
另一个错误是数值答案不写单位。即便计算正确，缺少单位也会丢分。始终要检查题目主干要求的单位。
In graph work, students often forget to label axes with quantity and unit, or they draw a bar chart when a line graph is appropriate. Draw a neat best-fit line, not a dot-to-dot.
在图像题中，学生常忘记给坐标轴标注物理量和单位，或者该画折线图时却画了条形图。要画一条平滑的最佳拟合线，而不是逐点连接。
12. Tips for Success | 成功技巧
Practice past papers under timed conditions. After each paper, use the mark scheme to check your answers and write down any key words you missed – Edexcel often demands specific scientific vocabulary.
在限时条件下练习历年真题。每做完一套，用评分方案核对答案，并记下你漏掉的关键词——Edexcel 常要求使用特定的科学术语。
Learn to highlight command words like “describe”, “explain”, and “calculate”. A “describe” question needs observations, while “explain” requires reasons using scientific principles.
学会圈出指令词，如”describe”、”explain”和”calculate”。”describe”题需要陈述观察结果，”explain”题则需要用科学原理解释原因。
Always show your working. Even if your final answer is wrong, you can earn method marks. Write formulas, substitutions, and the final answer clearly spaced out.
一定要展示解题过程。即使最终答案错误，也能拿到方法分。写下公式、代入过程和最终答案，排版清晰。
On the day of the exam, read every question carefully, manage your time, and stay calm. Confidence comes from thorough revision and knowing exactly what to expect.
考试当天，仔细阅读每道题，管理好时间，保持冷静。信心来自彻底复习和充分了解考试内容。
Published by TutorHao | Physics Revision Series | aleveler.com
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