📚 Year 10 WJEC Physics: A Deep Dive into Past Papers | WJEC十年级物理历年真题深度解析
Analysing past papers is one of the most powerful revision strategies for Year 10 WJEC Physics. By studying real exam questions, you uncover recurring patterns, understand exactly how examiners award marks, and learn to craft answers that hit the marking points. This guide will walk you through the core topics, common question types, and expert techniques extracted from actual WJEC papers, helping you turn past paper practice into top grades.
分析历年真题是十年级 WJEC 物理最强大的复习策略之一。通过研究真实考题，你能发现反复出现的模式，准确理解考官如何分配分数，并学会写出踩中得分点的答案。本指南将带你梳理核心主题、常见题型和从真实 WJEC 试卷中提炼的专家技巧，助你把刷真题的功夫转化为高分。
1. Understanding Motion Graphs | 理解运动图像
Distance-time and velocity-time graphs are standard features in WJEC Unit 2. A horizontal line on a distance-time graph means the object is stationary, while a straight, sloping line represents constant speed. If the line curves, the speed is changing—either accelerating or decelerating. The steeper the gradient, the greater the speed.
距离-时间图和速度-时间图是 WJEC 第二单元的标配。距离-时间图上的水平线表示物体静止，斜直线代表匀速运动。如果线条弯曲，则速度在变化——加速或减速。斜率越陡，速度越大。
Velocity-time graphs tell an even richer story. The gradient of the line equals acceleration, and the area between the graph line and the time axis equals the distance travelled. Many exam questions ask you to calculate the total distance from a multi-stage graph by splitting the area into rectangles and triangles. Remember that a horizontal line means constant velocity (zero acceleration), and a downward slope indicates deceleration.
速度-时间图蕴含着更多的信息。图线斜率等于加速度，图线与时间轴围成的面积等于移动的距离。许多考题要求你通过将面积分割为矩形和三角形来计算多段图线的总距离。记住，水平线表示匀速（加速度为零），向下倾斜表示减速。
speed = distance ÷ time | acceleration = change in velocity ÷ time
When tackling these graph questions, always check the axes first: is the y-axis distance or velocity? A common mistake is applying distance-time reasoning to a velocity-time graph. The WJEC mark scheme often awards one mark for recognising the shape of the graph and another for the correct numerical answer or unit.
解答这类图像题时，一定要先检查坐标轴：纵轴是距离还是速度？一个常见的错误就是把距离-时间图的推理照搬到速度-时间图上。WJEC 的评分标准经常是先给认出图像形状的一分，再给正确的数值答案或单位的一分。
2. Forces and Newton's Laws in Exam Questions | 力与牛顿定律考题
ar frequently in both calculation and explanation questions. WJEC expects you to recall Newton' sultant force is measured in newtons (N), mass in kilograms (kg), and acceleration in metres per second squared (m/s²). Balanced forces mean constant velocity or rest; unbalanced forces cause acceleration in the direction of the net force.
力、质量和加速度经常出现在计算和解释题中。WJEC 要求你记住牛顿第二定律的形式 F = m a，其中合力的单位是牛顿 (N)，质量是千克 (kg)，加速度是米每二次方秒 (m/s²)。平衡力意味着速度不变或静止；不平衡力导致物体沿合力方向加速。
o explain how weight changes on the Moon while mass remains constant. When a question involves friction or air resistance, subtract the opposing force from the driving force to find the resultant force before using F = m a.
重力是由引力产生的一种特殊的力：W = m g，地球上 g = 9.8 m/s²。考题可能要求你区分质量和重力，或解释为何在月球上重量变化而质量不变。当题目涉及摩擦力或空气阻力时，要先从驱动力中减去阻力得到合力，再使用 F = m a。
Many past papers include a scenario with a car towing a trailer or a skydiver. Be prepared to draw free-body diagrams, labelling all forces with arrows proportional to magnitude. The examiner looks for arrows pointing away from the object's centre, correctly labelled, and balanced if the object moves at constant speed.
很多历年试卷会涉及汽车拖挂车或跳伞者的情景。你要能画受力分析图，用与力大小成比例的箭头标出所有力。考官关注的是箭头从物体中心向外指、标注正确，并且如果物体匀速运动则力是平衡的。
3. Energy Transfers and Efficiency | 能量转化与效率
emical energy → electrical energy → light energy + thermal energy. You must be able to calculate kinetic energy (Eₖ = ½ m v²) and gravitational potential energy (Eₚ = m g h). In a falling object, Eₚ converts to Eₖ, and neglecting air resistance, total energy remains constant.
能量是 WJEC 物理的统一主题。题目常要求你描述一个系统中的能量转化，比如电池驱动的手电筒：化学能 → 电能 → 光能 + 热能。你必须会计算动能 (Eₖ = ½ m v²) 和重力势能 (Eₚ = m g h)。在下落物体中，Eₚ 转化为 Eₖ，忽略空气阻力时总能量守恒。
efficiency = (useful energy output ÷ total energy input) × 100%
Efficiency calculations are almost guaranteed. A classic past-paper task asks you to calculate the efficiency of a motor lifting a weight, where the useful work done is m g h and the total input is electrical energy from a joulemeter or power supply. Efficiency is always between 0 % and 100 %; values above 100 % suggest a calculation error or energy being drawn from an unaccounted source.
效率计算几乎是必考题。经典的真题任务是计算电动机提重物的效率，其中有用功为 m g h，总输入来自焦耳计或电源的电能。效率始终在 0 % 到 100 % 之间；超过 100 % 的值表明计算错误或有未计入的能量来源。
Another recurring theme is the Sankey diagram. You may be asked to draw or interpret one, ensuring the output arrow splits into useful and wasted energy, with arrow widths roughly proportional to energy amounts. WJEC mark schemes often credit correct labelling of wasted forms such as 'thermal energy in the surroundings' or 'sound'.
另一个反复出现的主题是桑基图。你可能需要绘制或解读桑基图，确保输出箭头分为有用能量和浪费能量，箭头粗细大致与能量多少成正比。WJEC 评分标准会奖励正确标注浪费能量形式，如“周围环境的热能”或“声能”。
4. Waves: Properties and the Electromagnetic Spectrum | 波的性质与电磁波谱
ater waves) oscillate perpendicular to the direction of energy transfer, while longitudinal waves (sound, seismic P-waves) oscillate parallel. The wavelength (λ), frequency (f), and wave speed (v) are linked by v = f λ, a formula you must be able to rearrange.
WJEC 试卷中的波动题既考察定性理解也考察定量技能。你需要知道横波（如光波、水波）的振动方向与能量传播方向垂直，而纵波（声波、地震P波）的振动方向与传播方向平行。波长 (λ)、频率 (f) 和波速 (v) 通过 v = f λ 关联，你必须能熟练变换该公式。
When describing waves in a ripple tank, use terms like 'wavefront' and 'plane waves'. A common question presents a diagram of waves passing from deep to shallow water and asks you to explain the change in wavelength and speed while frequency remains constant. The key is that speed decreases in shallow water, so wavelength must also decrease, as frequency stays the same because the source vibration does not change.
在描述水波槽中的波时，使用“波阵面”和“平面波”等术语。常见题目会给出波从深水区进入浅水区的示意图，要求你解释波长和波速的变化，而频率不变。要点是波速在浅水区减小，因此波长也必须减小，因为振源不变，频率保持不变。
The electromagnetic spectrum is a must-memorise sequence: radio, microwave, infrared, visible, ultraviolet, X-ray, gamma. Past papers frequently ask you to state a use and a danger for each region. For instance, microwaves are used for satellite communication and cooking but can cause internal tissue heating; X-rays are used for medical imaging but can damage DNA and cause cancer.
电磁波谱必须记牢：无线电波、微波、红外线、可见光、紫外线、X射线、伽马射线。历年真题常要求你说出每个频段的用途和危害。例如，微波用于卫星通信和烹饪，但会引起内部组织加热；X射线用于医学成像，但会损伤 DNA 并致癌。
5. Electricity: Circuits, Resistance, and I-V Characteristics | 电路、电阻与 I-V 特性
and parallel circuits. In a series circuit, current is the same everywhere, while the supply potential difference is shared between components. In a parallel circuit, the potential difference across each branch equals the supply voltage, and the total current is the sum of the branch currents.
电路分析是 WJEC 第一单元的主干。你必须熟练运用 V = I R 以及串联和并联电路的规则。在串联电路中，各处电流相同，电源电压在各元件间分配；在并联电路中，各支路两端电压等于电源电压，总电流等于各支路电流之和。
Resistors in series: Rtotal = R₁ + R₂ + ... | Resistors in parallel: 1/Rtotal = 1/R₁ + 1/R₂ + ...
Past papers frequently test the I-V characteristics of a fixed resistor, a filament lamp, and a diode. A fixed resistor gives a straight line through the origin (ohmic conductor). A filament lamp shows a curve flattening at higher voltages because the resistance increases with temperature. A diode only conducts in one direction, so the graph has a flat line at zero current in reverse bias and a steep rise in forward bias after the threshold voltage.
历年真题经常考查固定电阻器、灯丝灯泡和二极管的 I-V 特性。固定电阻器的图线是一条过原点的直线（欧姆导体）。灯丝灯泡的图线在较高电压下趋于平缓，因为电阻随温度升高而增大。二极管仅单向导通，因此反向偏压下电流为零的平直线，正向偏压超过阈值电压后电流陡增。
Thermistors and LDRs also appear. A thermistor's resistance falls as temperature rises; an LDR's resistance decreases as light intensity increases. A common exam question asks you to explain how a sensing circuit (e.g., for a fire alarm) works: as temperature increases, the thermistor's resistance drops, the potential difference across it changes, and this triggers a switch.
热敏电阻和光敏电阻也会出现。热敏电阻的阻值随温度升高而下降；光敏电阻的阻值随光照增强而减小。一道常见的考题让你解释传感电路（如火灾报警器）的工作原理：温度升高，热敏电阻阻值减小，其两端电压变化，从而触发开关。
6. Domestic Electricity and Safety | 家庭用电与安全
WJEC expects you to understand the UK mains supply (230 V, 50 Hz alternating current). The three-pin plug contains a live wire (brown), a neutral wire (blue), and an earth wire (green/yellow). The live wire carries the voltage, the neutral completes the circuit, and the earth is a safety wire that carries current to the ground if a fault occurs, preventing the metal case from becoming live.
WJEC 要求你了解英国家庭供电（230 V，50 Hz 交流电）。三脚插头包含火线（棕色）、零线（蓝色）和地线（黄绿色）。火线传输电压，零线构成回路，地线是安全线，当发生故障时将电流导入大地，防止电器金属外壳带电。
Fuses and circuit breakers are examined regularly. A fuse contains a thin wire that melts if the current exceeds the fuse rating, breaking the circuit. Choose a fuse rated just above the normal operating current of the appliance. For example, a 2 A appliance needs a 3 A fuse, not a 13 A one. Double insulation eliminates the need for an earth wire, and these appliances have a plastic case.
保险丝和断路器经常考查。保险丝内含细导线，当电流超过额定值时会熔断，从而断开电路。应选择额定电流略高于电器正常工作电流的保险丝。例如，一个 2 A 的电器需要 3 A 保险丝，而不是 13 A。双重绝缘的电器无需地线，其外壳为塑料。
Past questions ask you to calculate the current drawn by a kettle or the energy transferred in a heater. Always convert time to seconds and energy to joules unless the question specifies kilowatt-hours. The unit kilowatt-hour (kW h) is a unit of energy, not power.
电功率计算：P = I V 和 P = E / t。真题常让你计算电水壶的工作电流或加热器传输的能量。除非题目指定用千瓦时，否则始终将时间换算为秒、能量换算为焦耳。千瓦时 (kW h) 是能量单位，不是功率单位。
7. Radioactivity and Half-Life | 放射性及半衰期
Radioactivity questions combine descriptive answers, graphs, and particle equations. You need to know the nature of alpha (helium nucleus, ⁴₂He), beta (high-speed electron, ⁰₋₁e), and gamma (electromagnetic wave). Their penetrating power increases from alpha (stopped by paper) to beta (stopped by a few mm of aluminium) to gamma (reduced by thick lead). Ionising ability follows the opposite order.
放射性题目集描述性答案、图像和粒子方程于一体。你需要了解 α（氦核，⁴₂He）、β（高速电子，⁰₋₁e）和 γ（电磁波）的本质。穿透能力从 α（纸可阻挡）到 β（几毫米铝可阻挡）到 γ（厚铅减弱）依次增强，电离能力则顺序相反。
→ ²³⁴₉₀Th + ⁴₂He. In beta decay, a neutron turns into a proton and a beta particle, so the mass number stays the same but the atomic number increases by 1.
核衰变方程频繁出现。你必须配平原子序数和质量数。例如，铀-238 发生 α 衰变：²³⁸₉₂U → ²³⁴₉₀Th + ⁴₂He。在 β 衰变中，一个中子变为一个质子和一个 β 粒子，因此质量数不变，原子序数增加 1。
Half-life is the time taken for half the radioactive nuclei in a sample to decay, or for the activity to halve. WJEC often provides a graph of activity against time and asks you to read the half-life by finding two points where the activity halves. Alternatively, you may need to calculate the remaining activity after a number of half-lives. No equation is given for this—use repeated halving.
半衰期是样本中一半放射性原子核发生衰变所需的时间，或活度减半所需的时间。WJEC 经常给出活度-时间图，要求你通过找到活度减半的两个点来读取半衰期。也可能需要计算经过若干半衰期后的剩余活度。题中不会给出公式——使用重复减半法。
| Property | Alpha (α) | Beta (β) | Gamma (γ) |
|---|---|---|---|
| Nature | Helium nucleus (⁴₂He) | Electron (⁰₋₁e) | Electromagnetic wave |
| Penetration | Stopped by paper | Stopped by ~3 mm Al | Reduced by thick Pb |
| Ionising ability | Very high | Medium | Low |
8. Required Practicals and How to Answer Them | 必做实验及答题技巧
en describe an experiment and ask you to identify variables, suggest improvements, or process data. One core practical investigates how the extension of a spring varies with force (Hooke' ly proportional to the force up to the limit of proportionality. After this, the spring deforms plastically.
WJEC 实验题常描述一个实验，要求你识别变量、提出改进建议或处理数据。其中一个核心实验是探究弹簧的伸长量与力的关系（胡克定律：F = k x）。在弹性限度内，伸长量与力成正比；超出此限度，弹簧发生塑性形变。
Another practical examines resistance in a wire. You vary the length of a wire and measure the current at a constant voltage, then calculate resistance. Key marking points include: use a ruler with mm scale, keep current low to avoid heating, and take repeat readings for reliability. The data should be plotted on a graph of resistance against length, showing a straight line through the origin if the wire is uniform.
另一个实验是探究导线的电阻。改变导线长度，恒定电压下测量电流，再计算电阻。关键得分点包括：使用毫米刻度尺、保持低电流以避免发热，并重复测量以确保可靠性。数据应绘制成电阻-长度图，若导线均匀，图线为过原点的直线。
Radiation absorption practicals require you to explain how different materials affect the count rate of a Geiger-Müller tube. Always subtract background radiation, measured before the source is introduced. To investigate half-life using a simulation or thoron generator, you record count rate at regular time intervals and plot an exponential-style curve.
辐射吸收实验要求你解释不同材料如何影响盖革-米勒管的计数率。始终要减去本底辐射，本底辐射应在放入放射源前测量。使用模拟或钍射气发生剂研究半衰期时，需每隔相同时间间隔记录计数率，并绘制指数衰减曲线。
9. Common Mistakes and How to Avoid Them | 常见错误及避免方法
ins constant; weight is a force measured in newtons. Always use W = m g, with g = 9.8 m/s² unless told otherwise. Using grams instead of kilograms will give a force 1000 times too large.
WJEC 物理中最常见的错误之一就是混淆质量和重量，尤其是在单位换算时。质量以千克为单位且保持不变；重量是以牛顿为单位的力。始终使用 W = m g，除非另有说明，g = 9.8 m/s²。若使用克而不是千克，算出的力会大 1000 倍。
hen students fail to read axes labels. A flat line on a velocity-time graph means constant velocity, not stationary— imilarly, calculating gradient from a distance-time graph yields speed, but from a velocity-time graph it yields acceleration. Underline the axes titles before answering.
图像解读错误源于学生不阅读坐标轴标签。速度-时间图上的平直线表示匀速，而非静止——静止意味着速度为零。同样，从距离-时间图求斜率得到速度，但从速度-时间图求斜率则得到加速度。答题前先划出坐标轴标题。
must multiply by 2, divide by m, then take the square root. Practising rearranging each formula symbolically without numbers builds confidence and prevents arithmetic slips.
公式变形难倒许多考生，尤其是在能量主题中。对于 Eₖ = ½ m v²，要求 v 必须先乘以 2、除以 m，再开平方根。不用数字，仅用符号练习每个公式的变形，既能建立信心，又能防止计算失误。
10. Command Words: Describe, Explain, Compare | 指令词解析
Understanding WJEC command words is half the battle. 'Describe' asks you to state what happens, often in sequence, without giving reasons. For example, 'Describe the energy transfers in a solar cell' requires you to list the changes: light → electrical energy. 'Explain', however, demands a reason: why does the resistance of a lamp increase? se ? Because the metal filament heats up, ions vibrate more, making it harder for electrons to flow.
理解 WJEC 的指令词是成功的一半。“描述”要求你陈述发生了什么，通常按顺序，而不需给出原因。例如，“描述太阳能电池中的能量转化”需要你列出变化：光能 → 电能。然而，“解释”则要求给出原因：为什么灯泡的电阻会增大？因为金属灯丝升温，离子振动加剧，使电子更难流动。
'Compare' means identify similarities and differences. Use comparative language like 'higher', 'steeper', 'while'. A typical compare question might present two materials' stress-strain graphs. You must reference both materials in each sentence, e.g., 'Material A has a steeper initial gradient than material B, indicating greater stiffness.' Simply listing properties separately will not gain full marks.
“比较”意味着找出相同点和不同点。使用“更高”、“更陡”、“而”等比较性语言。典型比较题可能给出两种材料的应力-应变图。每句话必须同时提及两种材料，例如“材料 A 的初始斜率比材料 B 更陡，说明刚度更大。”单纯分别列出性质是不能得全分的。
'Evaluate' requires a judgement, usually supported by evidence. In a question about renewable vs. non-renewable energy sources, you would discuss advantages and disadvantages, then conclude with a reasoned statement like 'Although wind turbines are intermittent, their low carbon emissions make them a crucial part of the future energy mix.' The conclusion is essential for evaluation marks.
“评价”要求做出判断，通常要有证据支持。在关于可再生能源与不可再生能源的问题中，你要讨论优缺点，然后以有理有据的陈述作结，例如“尽管风力发电机具有间歇性，但其低碳排放使其成为未来能源结构的关键部分。”结论对拿到评价分至关重要。
11. Mathematical Skills: Rearranging Equations and Unit Conversions | 数学技巧：方程变形与单位换算
Physics and maths are inseparable in WJEC. You will be expected to rearrange equations confidently. For resistors in parallel, 1/Rtotal = 1/R₁ + 1/R₂, a common trap is to forget to take the reciprocal at the end. Instead of Rtotal = 1/(1/R₁ + 1/R₂), many students stop after adding the reciprocals, losing the final mark.
物理和数学在 WJEC 中密不可分。你必须能自信地变形公式。对于并联电阻 1/Rₜₒₜₐₗ = 1/R₁ + 1/R₂，一个常见陷阱是忘了最后取倒数。许多学生加完倒数后就停了，而不是 Rₜₒₜₐₗ = 1/(1/R₁ + 1/R₂)，从而丢掉最后一分。
Converting units is a key skill. Speeds are often given in km/h but must be in m/s for calculations: divide by 3.6. Distances may be in cm or mm—convert to metres. Time must be in seconds; if mass appears in grams, convert to kilograms by dividing by 1000. Write down your conversions explicitly in the working; WJEC examiners can award marks for correct conversion even if the final answer is wrong.
单位换算是一项关键技能。速度常以 km/h 给出，但计算时必须用 m/s：除以 3.6。距离可能以 cm 或 mm 给出——要换算
Published by TutorHao | Year 10 Physics Revision Series | aleveler.com
更多咨询请联系16621398022（同微信）
或截图后用「扫一扫 → 相册」选择本图