Energy Changes in a System (AQA GCSE Physics Combined Science): Flashcards
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13 cards from this deck
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Practise the cards
13 cards from this deck
4 ways energy transfers between stores
4 ways energy transfers between stores
Mechanical work, heating, electrical work, radiation
Mechanical work definition
Mechanical work definition
Force moves object over a distance
Heating energy transfer
Heating energy transfer
Energy transferred from hotter to colder object
Electrical work definition
Electrical work definition
Energy transferred by moving charge due to potential difference
Radiation energy transfer
Radiation energy transfer
Energy as electromagnetic wave (e.g., gamma-rays, UV)
Law of Conservation of Energy
Law of Conservation of Energy
Energy can't be created/destroyed; only transferred, stored, or dissipated
Closed system
Closed system
No energy can enter or leave
Pendulum energy at highest points
Pendulum energy at highest points
Maximum GPE
Pendulum energy at lowest point
Pendulum energy at lowest point
Maximum KE
Bungee jumper energy when rope fully extended
Bungee jumper energy when rope fully extended
KE is zero, all energy is EPE
When is work done
When is work done
When energy transfers from one store to another
Work done formula
Work done formula
(Work = Force × Distance)
Reducing unwanted energy transfers in pendulum
Reducing unwanted energy transfers in pendulum
Use lubricant (oil) or remove air particles