Physics P1

  • Created by: ellie
  • Created on: 23-05-15 19:18
What is Heat?
A measure of energy
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What happens when a substance us heated?
Particles gain kinetic energy
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What happens in gases and liquids?
Particles move faster
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What happens in solids?
Particles viberate
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What is temperature?
A measure of hotness
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What happens to the KE if somethings hot?
KE increases
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How does energy flow?
From hot to cool objects
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What happens if theres a difference in temperature?
Engery then flows between the two objects
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What does the specific heat capacity show?
How much energy something can store
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What is Specific heat capacity?
How much energy it takes to heat 1KG of something by 1 degree
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What is the formula for Specific heat capacity?
Energy= Mass x Specific heat capacity x temperature change
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Descibe the heating process?
Solid (melting), liquid (boiling), gas
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Descibe the process of cooling?
Gas (condensing), liquid (freezing), solid
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What is specific latent heat?
The energy needed to melt/boil 1KG material without changing its temperature
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Formula for Specific latent heat?
Energy= Specific latent heat x mass
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Where does conduction occur?
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Explain the process of conduction?
Conduction of heat is the process where viberting particles pass on extra kinetic energy to neighbouring particles
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Where does covection occur?
Liquids and gases
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Explain the process of convection?
Convection occurs when the more energetic particles move from the hotter region to the cooler region and taking their heat with them.
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How is radiation different to conduction and convection?
Does not need a medium to travel through and can only occur through transparent materials like air, sun or glass
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What is a good absorber and emitter of radiation?
Matt black surface
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Name a poor absorber?
White shiny surfaces as they deflect heat
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How to grills and toasters heat food?
Using infrared radiation
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Name a source that emmits infrared radiation?
A radiator
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Name a source that loses energy?
Computers and windows
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Name some ways to prevent energy lose?
Curtains can be used as windows are energy sinks
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What is payback time?
When you have something to reduce energy loss and eventually the money saved covers the initial cost
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Formula for payback time?
Payback time = Initial cost / annual saving
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Other cards in this set

Card 2


What happens when a substance us heated?


Particles gain kinetic energy

Card 3


What happens in gases and liquids?


Preview of the front of card 3

Card 4


What happens in solids?


Preview of the front of card 4

Card 5


What is temperature?


Preview of the front of card 5
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