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...
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...
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...
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 ...
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 ...
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 –...
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 ...
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...
