Physics

HideShow resource information
What is temperature?
a measure of the average energy of the paricles rather than the total energy of the substance
1 of 40
Where does heat always flow?
From hotter to colder objects, so the hotter object cool down and the colder object heats up
2 of 40
What happens to an objects particles when heated?
They move faster and vibrate more
3 of 40
When something is heated you..?
tranfer energy to its particles
4 of 40
Non metals thats don't conduct heat are called?
Thermal insulators
5 of 40
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
6 of 40
How do you feel cold?
By losing heat and NOT by gaining cold
7 of 40
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
8 of 40
Why are liquids and gases bad conductors of heat?
The particles aren't closely packed and touching
9 of 40
Where can convection happen?
In liquids and gases not solids
10 of 40
In convection, When heated air rises, why does it become dense?
Because it is farther away from the heat source.
11 of 40
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
12 of 40
How will a substance float in a gas/liquid?
If the substance is less dense than the gas or liquid
13 of 40
Definition of Density
How much a substance (mass kg) is present in a unit of volume
14 of 40
What do all objects emit?
thermal radiation
15 of 40
What do hot objects emit?
Infrared radiation
16 of 40
What is the state of infrared radiation?
Its a wave
17 of 40
What surfaces are bad at emitting and absorbing infrared?
Shiny light surfaces, as they reflect it
18 of 40
What surfaces are good at emitting infrared?
Dull matt black
19 of 40
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
20 of 40
What does luminous mean?
When an object gives out light (sun)
21 of 40
What does non luminous mean?
does not give out light (moon)
22 of 40
What does light travel in?
Straight lines, rays
23 of 40
What happens when a moon casts a shadow on earth?
An eclipse
24 of 40
What is the sharp inside of a shadow called and what light source makes it?
Umbra, small light source
25 of 40
What is the fuzzy outside of a shadow called and what light source causes it?
Penumbra, Big light source
26 of 40
What does opaque mean?
Not see through, light cant pass through
27 of 40
What does transparent mean?
Light passes through, such as clear glass
28 of 40
What does translucent mean?
Lets light through but breaks it up, such as frosted glass
29 of 40
What is a plane mirror?
A flat mirror that produces a virtual image behind the mirror
30 of 40
What does laterally inverted mean?
Left becomes right and right becomes left
31 of 40
Are the angle of incidence and angle of reflection equal?
yes
32 of 40
What do smooth surfaces and rough surfaces do to reflection?
Smooth surface=regular reflection Rough Surface=diffuse reflection
33 of 40
When does light direction change?
When it enters a substance of a different density
34 of 40
What is the bending of light called?
Refraction
35 of 40
What is it called when light rays dont leave a substance and reflect backwards and forwards
Total internal reflection
36 of 40
When will light undergo total internal reflection?
When the angle of incidence is greater than the critical angle.
37 of 40
What does white light split into?
a spectrum of 7 different colours
38 of 40
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
39 of 40
What are the primary colors?
Red, Green and blue
40 of 40

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

Comments

No comments have yet been made

Similar All resources:

See all All resources »See all Physics resources »