Unit 5 ns5
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![Page 1: Unit 5 ns5](https://reader038.fdocuments.us/reader038/viewer/2022100803/5a64f17d7f8b9a5f428b466d/html5/thumbnails/1.jpg)
HEAT AND LIGHT
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Thermal energy always travels from a hotter
object to a colder one. Some materials transfer
thermal energy easily. They are good
conductors. Materials that dont`t transfer
thermal energy easily are called insulators.
CONDUCTION
When two objects
are in contact,
thermal energy is
transferred from one
object to the other
CONVECTION
Thermal energy
travels through a gas
or a liquid by
convection.
RADIATION
Thermal energy can
be transferred
through space by
electromagnetic
waves.
![Page 3: Unit 5 ns5](https://reader038.fdocuments.us/reader038/viewer/2022100803/5a64f17d7f8b9a5f428b466d/html5/thumbnails/3.jpg)
MELTING
Solid Liquid
EXPANSION
Materials expand when
receive thermal energy
EVAPORATION
Liquid Gas
CHEMICAL CHANGES
Thermal energy can cause
permanent changes(example: when we cook food)
Thermal energy causes changes in the state of
some materials
![Page 4: Unit 5 ns5](https://reader038.fdocuments.us/reader038/viewer/2022100803/5a64f17d7f8b9a5f428b466d/html5/thumbnails/4.jpg)
Light is radiation that we can see with our eyes.
Light travels in straight lines.
Objects react to light in different ways:
Transparent
It doesn`t block
light
Translucent
It blocks some
light
Opaque
It blocks the light
completely
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REFLECTION
Some objects, like
mirrors, change the
direction of the light.
The mirrors reflect
the light.
REFRACTION
When light pass through
some transparent
substances (water) it
changes direction
slightly.