Reducing unwanted energy transfers (Edexcel GCSE Physics Combined Science): Flashcards
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Practise the cards
13 cards from this deck
Can any device be 100% efficient?
Can any device be 100% efficient?
No device is 100% efficient
Two ways to reduce unwanted energy transfers
Two ways to reduce unwanted energy transfers
Lubrication and thermal insulation
What does lubrication reduce?
What does lubrication reduce?
Friction between moving parts
Where does friction transfer energy to?
Where does friction transfer energy to?
Thermal energy store of objects
Example of a lubricant
Example of a lubricant
Oil
Physical state of most lubricants
Physical state of most lubricants
Liquids
Why are lubricants usually liquids?
Why are lubricants usually liquids?
They flow between objects and coat them
Lubrication example in vehicles
Lubrication example in vehicles
Oil in car engines reduces friction
What does thermal insulation reduce?
What does thermal insulation reduce?
Rate of heat energy transfer
Definition of conduction
Definition of conduction
Particles vibrate, collide and transfer energy when heated
Key property of insulation materials
Key property of insulation materials
Low thermal conductivity
Effect of lower thermal conductivity
Effect of lower thermal conductivity
Slower heat transfer
Effect of reducing wasted energy
Effect of reducing wasted energy
Increases efficiency