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...
如何准备牛剑心理学专业面试？
很多同学都对心理学专业牛津剑桥的面试感到一定的紧张，其实大可不必，引用剑桥大学考官的一句话，“这场面试不是为了为难同学们，而是给大家机会，让一群对这个专业感兴趣的人聚在一起，畅所欲言。” 那么面试前我...
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 ...
AQA A Level Physics复习笔记4.5.3 Impulse
Force & Momentum Force is defined as the rate of change of momentum on a body The change in momentum is defined as the final momentum minus the initial momentum These can be expressed as...
AQA A Level Physics复习笔记4.5.2 Conservation of Momentum
The Principle of Conservation of Momentum The principle of conservation of linear momentum states: The total momentum before a collision = the total momentum after a collision provided no ex...
