Physics

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What is temperature?
a measure of the average energy of the paricles rather than the total energy of the substance
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Where does heat always flow?
From hotter to colder objects, so the hotter object cool down and the colder object heats up
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What happens to an objects particles when heated?
They move faster and vibrate more
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When something is heated you..?
tranfer energy to its particles
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Non metals thats don't conduct heat are called?
Thermal insulators
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How do things such as ski jackets and duvets keep us warm?
They are made from padded material which trap warm air between their fibres
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How do you feel cold?
By losing heat and NOT by gaining cold
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Why is a solid metal pipe a good conductor of heat?
When the particles are heated they start to move a vibrate and bump into eachother passing on the vibration
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Why are liquids and gases bad conductors of heat?
The particles aren't closely packed and touching
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Where can convection happen?
In liquids and gases not solids
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In convection, When heated air rises, why does it become dense?
Because it is farther away from the heat source.
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What happens in the convection cycle?
Air is heated and rises up, The energy then sinks to the bottom and rises up again when heated again
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How will a substance float in a gas/liquid?
If the substance is less dense than the gas or liquid
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Definition of Density
How much a substance (mass kg) is present in a unit of volume
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What do all objects emit?
thermal radiation
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What do hot objects emit?
Infrared radiation
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What is the state of infrared radiation?
Its a wave
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What surfaces are bad at emitting and absorbing infrared?
Shiny light surfaces, as they reflect it
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What surfaces are good at emitting infrared?
Dull matt black
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What are a few methods to reduce heat loss from an object?
>A vaccum has no particles which reduces heat transfer >Shiny surfaces reflect infrared radiation >A stopper is made of an insulator so heat energy is not lost by conduction
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What does luminous mean?
When an object gives out light (sun)
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What does non luminous mean?
does not give out light (moon)
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What does light travel in?
Straight lines, rays
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What happens when a moon casts a shadow on earth?
An eclipse
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What is the sharp inside of a shadow called and what light source makes it?
Umbra, small light source
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What is the fuzzy outside of a shadow called and what light source causes it?
Penumbra, Big light source
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What does opaque mean?
Not see through, light cant pass through
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What does transparent mean?
Light passes through, such as clear glass
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What does translucent mean?
Lets light through but breaks it up, such as frosted glass
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What is a plane mirror?
A flat mirror that produces a virtual image behind the mirror
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What does laterally inverted mean?
Left becomes right and right becomes left
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Are the angle of incidence and angle of reflection equal?
yes
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What do smooth surfaces and rough surfaces do to reflection?
Smooth surface=regular reflection Rough Surface=diffuse reflection
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When does light direction change?
When it enters a substance of a different density
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What is the bending of light called?
Refraction
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What is it called when light rays dont leave a substance and reflect backwards and forwards
Total internal reflection
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When will light undergo total internal reflection?
When the angle of incidence is greater than the critical angle.
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What does white light split into?
a spectrum of 7 different colours
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Why do objects look coloured?
They reflect that colour and but absorb all the rest of the colours in white lighthite light. These reflected colours are detected at the back of our eyes
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What are the primary colors?
Red, Green and blue
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Other cards in this set

Card 2

Front

Where does heat always flow?

Back

From hotter to colder objects, so the hotter object cool down and the colder object heats up

Card 3

Front

What happens to an objects particles when heated?

Back

Preview of the front of card 3

Card 4

Front

When something is heated you..?

Back

Preview of the front of card 4

Card 5

Front

Non metals thats don't conduct heat are called?

Back

Preview of the front of card 5
View more cards

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