Conservation & Dissipation of Energy (AQA GCSE Physics Combined Science): Flashcards
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Conservation of energy principle
Conservation of energy principle
Energy cannot be created or destroyed
What three things can energy do?
What three things can energy do?
Be transferred, stored, or dissipated
What is a closed system?
What is a closed system?
A system where energy cannot enter or leave
What is the net energy change in a closed system?
What is the net energy change in a closed system?
Always zero
Useful energy definition
Useful energy definition
Energy transferred to desired store
Wasted energy definition
Wasted energy definition
Energy that ends up in other stores
Another term for wasted energy
Another term for wasted energy
Dissipated energy
Useful + wasted energy equals
Useful + wasted energy equals
Energy input
Two methods to minimise energy loss
Two methods to minimise energy loss
Thermal insulation and lubrication
Effect of thermal insulation
Effect of thermal insulation
Slows rate of heat loss
What lubrication reduces
What lubrication reduces
Friction between surfaces
What is thermal conductivity?
What is thermal conductivity?
How well a material transfers heat energy
Low thermal conductivity materials
Low thermal conductivity materials
Good thermal insulators
High thermal conductivity materials
High thermal conductivity materials
Poor thermal insulators