CIE A Level Physics复习笔记4.1.2 Moments
What is a Moment? A moment is the turning effect of a force Moments occur when forces cause objects to rotate about some pivot The moment of a force is given by Moment (N m) = Force (N) × perpendic...
CIE A Level Physics复习笔记4.1.1 Centre of Gravity
Centre of Gravity The centre of gravity of an object is the point at which the weight of the object may be considered to act For example, for a person standing upright, their centre of gravity is r...
CIE A Level Physics复习笔记3.2.2 Elastic & Inelastic Collisions
Elastic Collisions When two objects collide, they may spring apart retaining all of their kinetic energy. This is a perfect elastic collision An elastic collision is one where kinetic energy is con...
CIE A Level Physics复习笔记3.2.1 Conservation of Momentum
The Principle of Conservation of Momentum The principle of conservation of momentum is: The total momentum of a system remains constant provided no external force acts on it For example if two obje...
CIE A Level Physics复习笔记3.1.7 Terminal Velocity
Terminal Velocity For a body in free fall, the only force acting is its weight and its acceleration g is only due to gravity. The drag force increases as the body accelerates This increase in veloc...
CIE A Level Physics复习笔记3.1.6 Drag Force & Air Resistance
Drag Forces Drag forces are forces acting the opposite direction to an object moving through a fluid (either gas or liquid) Examples of drag forces are friction and air resistance A key component o...
2022年夏季A-level大考成绩放榜，2.8万人没offer！
前几天，2022年夏季A-level大考成绩开始放榜。 但在今日，英国《卫报》（the Guardian）爆料——在英国，约有2.8万名A-level学生还没有收到任何大学录取通知书，面临无大学可上的窘境。 约2.8万英国学生目前没有off...
CIE A Level Physics复习笔记3.1.5 Force & Momentum
Force & Momentum Force is defined as the rate of change of momentum on a body Force is equal to the rate of change in momentum The change in momentum is defined as the final momentum minus th...
CIE A Level Physics复习笔记3.1.4 Linear Momentum
Linear 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 magnitude and a directi...
CIE A Level Physics复习笔记3.1.3 Newton's Laws of Motion
Newton's Three Laws of Motion Newton’s First Law: A body will remain at rest or move with constant velocity unless acted on by a resultant force Worked Example If there are no external forces actin...
CIE A Level Physics复习笔记3.1.2 Force & Acceleration
Force & Acceleration As stated on the previous page, Newton's Second Law of Motion tells us that objects will accelerate if there is a resultant force acting upon them This acceleration will be...
CIE A Level Physics复习笔记3.1.1 Mass & Weight
What is 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 greater the mass of a body, the smaller the ...
