AQA A Level Physics复习笔记4.7.1 Density
Density Density is the mass per unit volume of an object Objects made from low-density materials typically have a lower mass For example, a balloon is less dense than a small bar of lead des...
AQA A Level Physics复习笔记4.6.5 Kinetic & Gravitational Potential Energy
Kinetic & Gravitational Potential Energy Kinetic Energy Kinetic energy is the energy an object has due to its motion (or velocity) The faster an object is moving, the greater its kinetic...
AQA A Level Physics复习笔记4.6.4 Conservation of Energy
The Principle of Conservation of Energy The Principle of Conservation of Energy states that: Energy cannot be created or destroyed, it can only be transferred from one form to another This m...
AQA A Level Physics复习笔记4.6.3 Efficiency
Efficiency The efficiency of a system is a measure of how well energy is transferred in a system Efficiency is defined as the ratio of the useful power output from a system to its total powe...
卫报：A-level学生申请顶尖大学录取率大幅下降！
《卫报》： A-level学生申请顶尖大学录取率降至55%！ 成千上万名优秀A-level学生不会获得顶尖大学offer！ A-level学生申请顶尖大学录取率降至55% 根据《卫报》报道，英国高等院校招生办公室(UCAS)的数据显示，申...
AQA A Level Physics复习笔记4.6.2 Area Under a Force-Displacement Graph
Area Under a Force-Displacement Graph The work done can also be found from a force-displacement graph If the force is not constant and is plotted against the displacement of the object: The ...
AQA A Level Physics复习笔记4.6.1 Work & Power
Work & Power Work is defined as The amount of energy transferred when an external force causes an object to move over a certain distance If the force is parallel to the direction of the ...
AQA A Level Physics复习笔记4.5.5 Collisions
Elastic & Inelastic Collisions In both collisions and explosions, momentum is always conserved However, kinetic energy might not always be A collision (or explosion) is either: Elastic –...
AQA A Level Physics复习笔记4.5.4 Impulse on a Force-Time Graph
Impulse of a Force-Time Graph In real life, forces are often not constant and will vary over time If the force is plotted against time, the impulse is equal to the area under the force-time ...
