Conservation of energy (Edexcel GCSE Physics): Flashcards
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Conservation of Energy principle
Conservation of Energy principle
Energy cannot be created or destroyed; only transferred between stores
What happens to energy?
What happens to energy?
It is transferred from one store to another
Definition of a system
Definition of a system
A group of things thought of as a whole
Total energy in a system
Total energy in a system
Always stays the same
Definition of closed system
Definition of closed system
System where no energy enters or leaves
Ball thrown up: initial energy store
Ball thrown up: initial energy store
Kinetic energy store
Ball thrown up: energy store as it rises
Ball thrown up: energy store as it rises
Gravitational potential energy store
Mechanical energy transfer
Mechanical energy transfer
Energy transferred when force moves an object
Electrical energy transfer
Electrical energy transfer
Energy transferred through electric currents
Heating energy transfer
Heating energy transfer
Energy moves from hot to cooler
Radiation energy transfer
Radiation energy transfer
Energy transferred by light or sound waves
Example of mechanical transfer
Example of mechanical transfer
Pushing car transfers energy to kinetic store
Example of radiation transfer
Example of radiation transfer
Sun's energy reaches Earth as sunlight