Edexcel IGCSE Physics: Double Science 复习笔记：4.1.3 Efficiency
Edexcel IGCSE Physics: Double Science 复习笔记：4.1.3 Efficiency Efficiency The efficiency of a system is a measure of how well energy is transferred in a system Efficiency is defined as: &n...
Edexcel A Level Maths: Pure:复习笔记7.2.2 Increasing & Decreasing Functions
Increasing & Decreasing Functions What are increasing and decreasing functions? A function f(x) is increasing on an interval [a, b] if f'(x) ≥ 0 for all values of x such that a< x < b. If...
Edexcel A Level Maths: Pure:复习笔记7.2.1 Gradients, Tangents & Normals
Gradients, Tangents & Normals Using the derivative to find the gradient of a curve To find the gradient of a curve y= f(x) at any point on the curve, substitute the x‑coordinate of the point in...
Edexcel A Level Maths: Pure:复习笔记7.1.3 Differentiating Powers of x
Differentiating Powers of x How do I differentiate expressions involving powers of x? Powers of x are differentiated according to the following formulae: Differentiating terms with positive integer...
Edexcel IGCSE Physics: Double Science 复习笔记：4.1.2 Conservation of Energy
Edexcel IGCSE Physics: Double Science 复习笔记：4.1.2 Conservation of Energy Conservation of Energy The principle of conservation of energy states that: Energy cannot be created or de...
Edexcel IGCSE Physics: Double Science 复习笔记：4.1.1 Energy Stores & Transfers
Edexcel IGCSE Physics: Double Science 复习笔记：4.1.1 Energy Stores & Transfers Energy Stores & Transfers Energy can be stored in different ways, and there are changes in the way it ...
Edexcel A Level Maths: Pure:复习笔记7.1.2 First Principles Differentiation
First Principles Differentiation What is the derivative or gradient function? For a curve y = f(x) there is an associated function called the derivative or gradient function The derivative of f(x) ...
Edexcel A Level Maths: Pure:复习笔记7.1.1 Definition of Gradient
Definition of Gradient What is the gradient of a curve? At a given point the gradient of a curve is defined as the gradient of the tangent to the curve at that point A tangent to a curve is a line ...
Edexcel A Level Maths: Pure:复习笔记6.3.3 Using Log Graphs in Modelling
Using Log Graphs in Modelling What are log graphs? Log graphs are used when the scale of a graph increases or decreases exponentially It can very difficult to read specific values from graphs with ...
Edexcel IGCSE Physics: Double Science 复习笔记：3.2.6 Total Internal Reflection
Edexcel IGCSE Physics: Double Science 复习笔记：3.2.6 Total Internal Reflection Total Internal Reflection Sometimes, when light is moving from a denser medium towards a less dense one, inste...
Edexcel A Level Maths: Pure:复习笔记6.3.2 Using Exps & Logs in Modelling
Using Exps & Logs in Modelling What is exponential modelling? Exponential modelling is where real-life situations are modelled using exponential growth and decay Exponential growth is typically...
Edexcel IGCSE Physics: Double Science 复习笔记： 3.2.2 Reflection & Refraction
Reflection & Refraction All waves, whether transverse or longitudinal, can be reflected and refracted Reflection occurs when: A wave hits a boundary between two media and does not...
