2022年英国中级生物奥赛IBO报名开启！10-11年级同学不要错过！
IBO（Intermediate Biology Olympiad）英国中级生物奥赛面向高一、高二年级（GCSE和A1），是英国生物测评的初阶活动。 学术活动将资优学生聚集在一起，挑战和激励这些学生扩大他们的才能，并促进他们未来的科学家...
2023FALL美国多所大学公布申请截止时间！
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2022年美国数学竞赛AMC报名即将截止！为什么一定要参加美国AMC？
近几年来，美本竞争不断白热化，SAT/ACT、托福、GPA这些标化成绩已经很难让同学们在庞大的留学生群体中脱颖而出。这个时候，就需要一些活动学术活动来帮助同学们提升“软背景”，提高申请竞争力。今天要介绍的美国A...
Edexcel A Level Physics:复习笔记2.14 Conservation of Linear Momentum
The Principle of Conservation of Linear Momentum The principle of conservation of momentum states that in a closed system, the total momentum before an event is equal to the total momentum after th...
Edexcel A Level Physics:复习笔记2.13 Momentum
Defining Momentum Linear momentum (p) is defined as the product of mass and velocity Momentum is the product of mass and velocity Momentum is a vector quantity - it has both a magnitu...
Edexcel A Level Physics:复习笔记2.12 Newton's Third Law of Motion
Newton's Third Law of Motion Newton’s third law of motion states: Whenever two bodies interact, the forces they exert on each other are equal in size, act in opposite directions, and are of the sam...
Edexcel A Level Physics:复习笔记2.11 Core Practical 1: Investigating the Acceleration of Freefall
Acceleration of Freefall Using Electromagnets & Light Gates Aim of the Investigations The overall aim of these investigations is to calculate the value of the acceleration due to gravity, g The...
Edexcel A Level Physics:复习笔记2.10 Mass, Weight & Gravitational Field Strength
Mass, Weight & Gravitational Field Strength Mass Mass is the measure of the amount of matter in an object Consequently, this is the property of an object that resists change in motion The great...
Edexcel A Level Physics:复习笔记2.9 Force & Acceleration
Newton's First Law of Motion Newton's First Law states: A body will remain at rest or move with constant velocity unless acted on by a resultant force The law is used to explain why things move wit...
Edexcel A Level Physics:复习笔记2.8 Forces as Vectors
Free-body Force Diagrams Free body diagrams are useful for modeling the forces that are acting on an object Each force is represented as a vector arrow, where each arrow: Is scaled to the magnitude...
Edexcel A Level Physics:复习笔记2.7 Projectiles
Components of Velocity The trajectory of an object undergoing projectile motion consists of a vertical component and a horizontal component These need to be evaluated separately Some key ter...
Edexcel A Level Physics:复习笔记2.6 Finding the Resultant Vector
Adding Vectors Vectors can be combined by adding or subtracting them to produce the resultant vector The resultant vector is sometimes known as the ‘net’ vector (eg. the net force) There are...
