Year 7 Edexcel Physics: Unit Test Mock Paper Analysis | Year 7 Edexcel 物理：单元测试模拟卷解析

📚 Year 7 Edexcel Physics: Unit Test Mock Paper Analysis | Year 7 Edexcel 物理：单元测试模拟卷解析

This article provides a complete walkthrough of a mock unit test for Year 7 Edexcel Physics. It covers key topics including forces, energy, waves, and electricity, offering detailed solutions and explanations to help students prepare effectively.

本文全面解析 Year 7 Edexcel 物理单元测试模拟卷，涵盖力、能量、波和电学等重点，提供详细答案与解释，帮助学生高效备考。

1. Forces Multiple Choice and Units | 力的选择题与单位

Question 1: Which of the following is a non-contact force? A) Friction, B) Gravity, C) Air resistance, D) Tension. The correct answer is B Gravity. A non-contact force can act over a distance without direct physical touch. Gravity, magnetism, and electrostatic forces are non-contact; friction, air resistance, and tension require contact between objects.

第1题：以下哪个是非接触力？正确答案是B 重力。非接触力能在一定距离外作用，无需直接接触，例如重力、磁力和静电力；摩擦力、空气阻力和张力则需要物体间接触。

Question 4: What is the unit of force? The SI unit of force is the newton, symbol N. One newton is defined as the force required to give a mass of 1 kilogram an acceleration of 1 metre per second squared.

第4题：力的单位是什么？力的国际单位是牛顿，符号为N。1牛顿的定义是使1千克质量产生1米每二次方秒加速度所需的力。

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2. Calculating Speed | 速度计算

Question 2: A car moves 100 metres in 20 seconds. Calculate its average speed. Use the formula:

average speed = total distance ÷ total time

Substitute values: speed = 100 m ÷ 20 s = 5 m/s. So the car travels at 5 metres per second.

第2题：一辆汽车在20秒内行驶100米，计算平均速度。公式：平均速度 = 总距离 ÷ 总时间。代入数值：速度 = 100 m ÷ 20 s = 5 m/s。因此汽车以每秒5米的速度行驶。

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3. Force Diagrams and Balanced Forces | 力图与平衡力

Question 3: Draw a force diagram for a book resting on a horizontal table. Label the forces. The two forces acting are weight (gravitational pull) acting downwards from the centre of the book, and the normal contact (reaction) force from the table acting upwards. The arrows should be equal in length because the forces are balanced—the book is stationary.

第3题：画出静止在水平桌面上的书的力图并标注力。两个力是：竖直向下的重力（作用于书的重心）和桌面对书的支持力（法向接触力）竖直向上。箭头长度应相等，因为二力平衡，书本保持静止。

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4. Resultant Forces and Friction | 合力与摩擦力

Question 5: A student pushes a box horizontally with a force of 50 N. Friction between the box and the floor is 30 N. Find the resultant force. Resultant force = pushing force – friction = 50 N – 30 N = 20 N in the direction of the push. When a resultant force acts, the object accelerates; here the box will speed up.

第5题：学生用50 N的水平力推箱子，箱子与地面间摩擦力为30 N。求合力。合力 = 推力 – 摩擦力 = 50 N – 30 N = 20 N，方向与推力相同。当存在合力时，物体会加速；这里箱子将加速运动。

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5. Energy Stores and Transfers | 能量储存与转移

Question 6: A torch is switched on. Describe the energy stores and transfers that occur. The chemical energy store of the battery decreases; energy is transferred electrically to the bulb, where it is transferred by radiation (light) and heating (thermal). The pathway can be summarised as:

Chemical energy store (battery) → Electrical transfer → Light + Thermal energy stores (surroundings)

第6题：打开手电筒，描述发生的能量储存与转移。电池的化学能储存减少，能量通过电流转移至灯泡，在灯泡处以光辐射和热传递的形式散失。路径可总结为：化学能储存（电池）→ 电能转移 → 光能和内能储存（环境）。

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6. Renewable and Non-renewable Resources | 可再生能源与不可再生能源

Question 7: Give two examples of renewable energy resources and two examples of non-renewable resources. Common renewable resources include solar, wind, tidal, and hydroelectric power. Non-renewable resources include fossil fuels (coal, oil, natural gas) and nuclear fuel (uranium). Renewables can be replenished naturally; non-renewables are finite and produce greenhouse gases when burned (except nuclear).

第7题：举出两种可再生能源和两种不可再生能源的例子。常见可再生能源包括太阳能、风能、潮汐能和水力发电。不可再生能源包括化石燃料（煤、石油、天然气）与核燃料（铀）。可再生能源可自然补充；不可再生能源储量有限，燃烧时会产生温室气体（核能除外）。

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7. Sound Waves and Mediums | 声波与介质

Question 8: In which state of matter does sound travel fastest — solid, liquid, or gas? Sound travels fastest in solids, slower in liquids, and slowest in gases. This is because particles are packed most closely in solids, allowing vibrations (compressions) to be passed on more efficiently.

第8题：声音在哪种物态中传播最快——固体、液体还是气体？声音在固体中传播最快，液体次之，气体中最慢。这是因为固体中粒子排列最紧密，振动（压缩波）能够更高效地传递。

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8. Light Reflection | 光的反射

Question 9: Draw a ray diagram to show light reflecting off a plane mirror. Label the incident ray, reflected ray, normal, and angles. The law of reflection states:

angle of incidence = angle of reflection

Both angles are measured from the normal (an imaginary line perpendicular to the mirror surface). The incident ray, reflected ray, and normal all lie in the same plane.

第9题：画出光在平面镜上反射的光路图，标注入射光线、反射光线、法线和角度。反射定律指出：入射角等于反射角。两角均从法线（垂直于镜面的假想线）量起。入射光线、反射光线和法线在同一平面内。

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9. Electric Circuits in Series | 串联电路

Question 10: Construct a series circuit containing a battery, a switch, and two light bulbs. If one bulb breaks (blows), explain what happens. In a series circuit, there is only one loop for current. If one bulb breaks, the circuit becomes incomplete, current stops flowing, and both bulbs go out. This is a disadvantage of series circuits — if one component fails, all others stop working.

第10题：构建一个包含电池、开关和两个灯泡的串联电路。如果一个灯泡损坏（灯丝烧断），会发生什么？串联电路中电流只有一条回路。如果一个灯泡损坏，电路断开，电流停止流动，两个灯泡都会熄灭。这是串联电路的缺点——一个元件故障将导致整体停止工作。

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