Conservation & Dissipation of Energy (OCR GCSE Physics A, Combined (Gateway Science Suite)): Flashcards
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15 cards from this deck
Can energy be created or destroyed?
Can energy be created or destroyed?
No, energy cannot be created or destroyed
What is a closed system?
What is a closed system?
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?
Zero
Useful energy definition
Useful energy definition
Energy successfully transferred to the desired store
Wasted energy definition
Wasted energy definition
Energy that ends up in other stores (dissipated)
Useful + wasted energy =
Useful + wasted energy =
Energy input
Method to reduce heat energy loss
Method to reduce heat energy loss
Thermal insulation
Method to reduce friction energy loss
Method to reduce friction energy loss
Lubrication
Purpose of insulation
Purpose of insulation
Slows down the rate of heat loss
How lubrication reduces friction
How lubrication reduces friction
Makes surfaces smoother
Thermal conductivity definition
Thermal conductivity definition
How well a material transfers heat energy
Low thermal conductivity materials
Low thermal conductivity materials
Transfer less heat, good thermal insulators
High thermal conductivity materials
High thermal conductivity materials
Transfer more heat, poor thermal insulators
Thermal conductivity of metal
Thermal conductivity of metal
High
Thermal conductivity of plastic
Thermal conductivity of plastic
Low