CIE A Level Physics复习笔记5.2.2 Kinetic Energy
Derivation of KE = 1/2mv2 Kinetic energy is energy an object has due to its motion (or velocity) A force can make an object accelerate; work is done by the force and energy is transferred to the ob...
CIE A Level Physics复习笔记5.2.1 Gravitational Potential Energy
Derivation of GPE = mgh Gravitational potential energy is energy stored in a mass due to its position in a gravitational field When a heavy object is lifted, work is done since the object is provid...
CIE A Level Physics复习笔记5.1.5 Derivation of P = Fv
Derivation of P = Fv Moving power is defined by the equation: This equation is only relevant where a constant force moves a body at constant velocity. Power is required in order to produce an accel...
CIE A Level Physics复习笔记5.1.4 Power
Defining Power The power of a machine is the rate at which it transfers energy Since work done is equal to the energy transferred, power can also be defined as the rate of doing work or the work do...
CIE A Level Physics复习笔记5.1.3 Efficiency
Efficiency of a System The efficiency of a system is the ratio of the useful energy output from the system to the total energy input If a system has high efficiency, this means most of the energy t...
CIE A Level Physics复习笔记5.1.2 The Principle of 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 change from one form to another This means the total ...
CIE A Level Physics复习笔记5.1.1 Work & Energy
Work Done In Physics, work is done when an object is moved over a distance by an external force applied in the direction of its displacement In the diagram below, the man’s pushing force on the blo...
CIE A Level Physics复习笔记4.2.5 Archimedes Principle
Archimedes' Principle Archimedes’ principle states that an object submerged in a fluid at rest has an upward buoyancy force (upthrust) equal to the weight of the fluid displaced by the object The o...
CIE A Level Physics复习笔记4.2.4 Upthrust
Upthrust Upthrust is a force which pushes upwards on an object submerged in a fluid i.e. liquids and gases Also known as buoyancy force, upthrust is due to the difference in hydrostatic pressure at...
