Conservation of Energy (OCR GCSE Physics A (Gateway Science Suite)): Flashcards
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Conservation of energy principle
Conservation of energy principle
Energy cannot be created or destroyed
Three things energy can do
Three things energy can do
Be transferred, stored, or dissipated
Net energy change in a closed system
Net energy change in a closed system
Always zero
Useful energy
Useful energy
Energy successfully transferred to intended store
Wasted energy
Wasted energy
Energy that ends up in other stores
Another term for wasted energy
Another term for wasted energy
Dissipated
Light bulb: which output is wasted?
Light bulb: which output is wasted?
Heat (light is the useful output)
Useful energy + wasted energy =
Useful energy + wasted energy =
Energy input
Two methods to minimise energy loss
Two methods to minimise energy loss
Thermal insulation and lubrication
What insulation does
What insulation does
Slows rate of heat loss
What lubrication reduces
What lubrication reduces
Friction
Thermal conductivity
Thermal conductivity
How well a material transfers heat energy
Materials with low thermal conductivity
Materials with low thermal conductivity
Good thermal insulators
Materials with high thermal conductivity
Materials with high thermal conductivity
Poor thermal insulators