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Heat and Magnets
Heat and magnets unit study guide
39
Science
3rd Grade
02/09/2009

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Term
heat
Definition
a form of energy that makes matter warmer
Term
temperature
Definition
a measure of how warm or cold something is
Term
degrees
Definition
the unit temperature is measured with
Term
thermometer
Definition
the instrument used to measure temperature
Term
conductor
Definition
material that heat moves through easily
Term
insulator
Definition
a material that heat does NOT move through easily
Term
metal
Definition
a hard, shiny material found in Earth's ground
Term
magnet
Definition
an object that attracts iron and some other metals
Term
magnetite
Definition
a rock that acts like a weak magnet
Term
permanent magnets
Definition
magnets that we use (like on the refridgerator) that are often made of iron or steel
Term
poles
Definition
the two ends of magnets where the pull, or force, of a magnet is the strongest
Term
How many poles does a magnet have?
Definition
two -- a North and a South
Term
attract
Definition
two magnets that are opposite poles (N and S) will attract or come together
Term
repel
Definition
two magnets with like poles (N and N) or (S and S) will repel or push away form each other
Term
magnetic field
Definition
a region of magnetic force
Term
electromagnet
Definition
a temporary magnet formed when current flows
Term
What instrument do we use to measure temperature?
Definition
thermometer
Term
When a material does not conduct heat easily it is called a(n)...
Definition
insulator
Term
When a material conducts heat easily then it is called a ...
Definition
conductor
Term
When we measure how warm or cold something is we are checking it's...
Definition
temperature
Term
What are the two ends of a magnet called?
Definition
poles
Term
When two like poles (N and N) are put near each other what will happen?
Definition
They will repel.
Term
When two opposite poles (N and S) are placed together, what will happen?
Definition
They will attract.
Term
What is the Earth's main source of heat?
Definition
The Sun.
Term
Can heat move through solids, liquids and gases?
Definition
Yes! It can even move through Space!
Term
What happens to particles when they are heated up?
Definition
They expand.
Term
What happens when matter cools down?
Definition
Particles slow down and come closer together.
Term
What happens to the mercury in a thermometer when it is placed somewhere warm?
Definition
It expands and rises.
Term
Heat always moves from warmer objects to...
Definition
cooler ones.
Term
What is something that is usually a good conductor?
Definition
Most metals.
Term
What are some examples of insulators?
Definition
Wool, cotton, and fur.
Term
What are some things that create heat, besides the Sun?
Definition
Fire, light bulbs, and oven/toaster coils.
Term
What is the symbol for degrees?
Definition
A tiny o that is raised.
Term
What does water need a lot of before it can heat up?
Definition
Energy.
Term
What is the differnce between a permanent and an electro- magnet?
Definition
Permanent are always magnets (like the ones on the fridge), but electromagnets are only magnets when current flows through them.
Term
What is a rock that acts like a weak magent called?
Definition
magnetite
Term
An object that attracts iron and other metals is called a ...
Definition
magnet
Term
The unit that temperature is measured with (like inches) is called?
Definition
degrees
Term
A form of energy that makes matter warmer is?
Definition
heat
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