📚 Year 11 CCEA Physics: Key Terminology Quick-Memory Guide | CCEA 11年级物理：核心术语速记指南
This quick-memory guide breaks down the essential terms every Year 11 CCEA Physics student must master. Each term is presented with a clear English definition followed by its Chinese translation, helping you build a bilingual command of physics vocabulary – perfect for revision and exam recall.
本速记指南梳理了每个CCEA 11年级物理学生必须掌握的核心术语。每个术语先给出清晰的英文定义，再配以中文翻译，帮助你在备考和考试中建立双语物理词汇的精准记忆。
1. Forces and Motion | 力与运动
Displacement: The distance moved in a straight line in a given direction, a vector quantity measured in metres (m).
位移：沿给定方向的直线距离，是矢量，单位为米 (m)。
Velocity: Speed with a specified direction; v = Δs / Δt, also a vector.
速度：具有特定方向的速度快慢；v = Δs / Δt，也是矢量。
²). It can be positive (speeding up) or negative (slowing down, also called deceleration).
加速度：速度的变化率，a = Δv / Δt (m/s²)。可为正加速或负加速（减速）。
Newton's First Law: An object remains at rest or in uniform motion unless acted on by a resultant force.
牛顿第一定律：物体将保持静止或匀速直线运动，除非受到合外力的作用。
ct as all the forces acting on an object. It determines acceleration according to F = m a.
合力：与作用在物体上所有力效果相同的单一力，依据 F = m a 决定加速度。
Weight: The force of gravity on a mass; W = m g, where g ≈ 10 N/kg on Earth.
重量：质量所受的重力；W = m g，在地球上 g ≈ 10 N/kg。
Terminal velocity: The constant maximum velocity reached by a falling object when drag force equals weight.
终极速度：当阻力等于重力时，下落物体达到的恒定最大速度。
= thinking distance + braking distance. Affected by speed, reaction time, road conditions.
制动距离 = 反应距离 + 刹车距离。受车速、反应时间、路面状况影响。
m: Product of mass and velocity, p = m v. In a closed system, total momentum is conserved.
动量：质量与速度的乘积，p = m v。在封闭系统中，总动量守恒。
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