📚 Year 9 CCEA Physics: Core Concepts Review | 九年级 CCEA 物理：核心知识点梳理
This comprehensive review covers the key physics concepts taught in Year 9 under the CCEA curriculum. You will explore forces, energy, electricity, waves, matter and space. Mastering these topics will strengthen your scientific understanding and prepare you for future GCSE study. We break down each concept into clear, bilingual explanations to help you learn effectively.
本文全面回顾CCEA课程九年级物理的核心概念。你将探索力、能量、电学、波、物质和空间等主题。掌握这些内容将加深你的科学理解，为未来的GCSE学习做好准备。我们以清晰的双语解释帮你有效地学习每一个概念。
1. Forces and Motion | 力与运动
Scalars and Vectors: Physical quantities are either scalars or vectors. Scalars have magnitude only, e.g., distance, speed and mass. Vectors have both magnitude and direction, e.g., displacement, velocity and force.
标量与矢量：物理量分为标量和矢量。标量只有大小，如距离、速率和质量。矢量既有大小又有方向，如位移、速度和力。
Calculating Speed: Speed measures how fast an object moves. It is defined as the distance travelled per unit time.
v = d / t
where v is speed, d is distance and t is time. The SI unit is metres per second (m/s).
计算速度：速度衡量物体运动的快慢，定义为单位时间内移动的距离。
v = d / t
其中 v 是速度，d 是距离，t 是时间。国际单位是米每秒 (m/s)。
Distance–Time Graphs: A distance–time graph shows how far an object has travelled over time. The gradient (steepness) of the line represents speed. A horizontal line means the object is stationary; a straight, sloping line indicates constant speed; a curved line shows changing speed (acceleration).
距离–时间图：距离–时间图显示物体随时间移动的距离。线的斜率（陡度）代表速度的大小。水平线表示物体静止；一条倾斜的直线表示匀速运动；曲线表示速度在变化的运动（加速）。
Balanced and Unbalanced Forces: A force is a push or a pull. When forces on an object are balanced, the resultant force is zero and the object either stays at rest or continues to move at a constant velocity. If forces are unbalanced, there is a resultant force that causes the object to accelerate or decelerate.
平衡力与不平衡力：力是推或拉的作用。当物体受到的力平衡时，合力为零，物体要么保持静止，要么以恒定速度继续运动。如果力不平衡，就会产生合力，导致物体加速或减速。
Friction: Friction is a force that opposes motion between two surfaces in contact. It can be useful (e.g., walking) or a problem (e.g., causing wear). Air resistance is a type of friction experienced by objects moving through air.
摩擦力：摩擦力是阻碍两个接触表面相对运动的力。它可以是有益的（如走路），也可以是有害的（如造成磨损）。空气阻力是物体在空气中移动时所经历的一种摩擦力。
Mass and Weight: Mass is the amount of matter in an object, measured in kilograms (kg). Weight is the gravitational force acting on that mass, calculated by
W = m × g
where g is the gravitational field strength (about 10 N/kg on Earth). Weight is measured in newtons (N).
质量与重量：质量是物体所含物质的多少，单位是千克 (kg)。重量是作用在该质量上的引力，计算公式为
W = m × g
其中 g 是重力场强度（地球表面约为10 N/kg）。重量的单位是牛顿 (N)。
2. Energy | 能量
Energy Stores: Energy can be stored in different ways: kinetic energy (movement), thermal (or internal) energy, chemical energy (in fuels, food and batteries), gravitational potential energy (due to height), elastic potential energy (stretched or compressed springs) and nuclear energy.
能量储存：能量可以以不同方式储存：动能（运动）、热能（内能）、化学能（燃料、食物和电池中）、重力势能（由于高度）、弹性势能（拉伸或压缩的弹簧）以及核能。
Energy Transfers: Energy is transferred
Published by TutorHao | Year 9 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