📚 Year 8 CCEA Physics Summer Bridging Course | CCEA 八年级物理暑期预习衔接课程
As you prepare to enter Year 8, a head start in Physics can boost your confidence and deepen your understanding of the world. This summer bridging course covers the core CCEA topics, from forces and energy to electricity, waves, and space. By previewing key ideas and practising simple investigations, you will build a strong foundation for the school year ahead.
在进入八年级之际，提前预习物理可以增强信心并加深对世界的理解。这份暑期衔接课程涵盖CCEA核心主题，从力与能量到电学、波动和太空。通过预习关键概念和练习简单的探究实验，你将为新学年打下坚实基础。
1. Why a Summer Bridging Course? | 为什么需要暑期衔接课程？
Physics in Year 8 introduces many new ideas and mathematical skills. A bridging course helps you become familiar with scientific vocabulary, units, and practical methods before lessons begin. It also allows you to identify topics that might need extra attention, making your learning more efficient.
八年级物理引入许多新概念和数学技能。衔接课程帮助你在课前熟悉科学词汇、单位和实验方法。它还可以让你找出可能需要额外关注的主题，从而让学习更高效。
This course does not replace classroom teaching but serves as a roadmap. You will explore real-world examples, try simple calculations, and learn how to design fair tests. The goal is to turn summer into a productive and enjoyable learning period.
本课程不会取代课堂教学，而是作为一份路线图。你将探索实际例子，尝试简单的计算，并学习如何设计公平实验。目标是把暑假变成一段充实而愉快的学习时光。
2. Forces: Push, Pull, and Gravity | 力：推、拉与重力
A force is a push or a pull that can change an object's speed, direction, or shape. Forces are measured in newtons (N). Gravity is a non-contact force that pulls objects towards the centre of the Earth. Your weight is the force of gravity acting on your mass.
力是能够改变物体速度、方向或形状的推或拉。力的单位是牛顿（N）。重力是一种非接触力，将物体拉向地球中心。你的体重就是重力作用于你的质量所产生的力。
nge with location. Weight depends on gravity and is calculated using g ≈ 10 N/kg on Earth:
weight = mass × g
质量与重量常被混淆。质量是物体所含物质的多少（单位为千克），不随地点改变。重量依赖于重力，地球上g约10 N/kg，计算公式为：
重量 = 质量 × g
Forces can also deform objects. Stretching a spring, compressing a sponge, or bending a ruler are all examples of forces causing deformation. Elastic materials return to their original shape, while plastic materials stay permanently changed.
力也能使物体变形。拉伸弹簧、压缩海绵或弯曲尺子都是力导致变形的例子。弹性材料能恢复原状，而塑性材料会保持永久变形。
3. Friction and Air Resistance | 摩擦力与空气阻力
Friction is a force that opposes motion between two surfaces in contact. It can be useful (helping us walk without slipping) or a nuisance (causing wear in machines). Air resistance is a type of friction experienced by objects moving through air.
摩擦力是阻碍两个接触表面相对运动的力。它可能有用（帮助我们走路不打滑），也可能带来麻烦（造成机器磨损）。空气阻力是物体在空气中运动时所受的一种摩擦力。
Streamlining reduces air resistance by shaping objects so that air flows smoothly around them. Cyclists, cars, and aircraft are designed with streamlined shapes to increase speed and save energy. You can investigate friction by pulling a block across different surfaces and measuring the force with a spring balance.
流线型设计通过让物体周围气流平顺来减小空气阻力。自行车手、汽车和飞机都设计成流线型，以提高速度并节省能量。你可以通过在不同表面上拉动木块并用弹簧秤测量力来探究摩擦力。
4. Speed and Distance-Time Graphs | 速度与路程-时间图
Speed tells you how fast an object is moving. It can be calculated using:
average speed = total distance ÷ total time
Speed is measured in metres per second (m/s) or kilometres per hour (km/h).
速度描述物体运动的快慢。可用以下公式
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