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SS4 unit 6-7
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We use it to cut objects.
 
A wedge
 
A lever
 
A pulley
a round object that turns around a pin or pole.
 
wheel and axle
 
lever
 
wedge
 
screw
the action of moving something,
 
Work
 
power
any basic devices that work with the use a single force
 
simple machines
 
complex machines
 
compound machines
 
washing machines
an inclined plane wrapped around a rod (a metal stick) often used to hold things together.
 
Screw
 
Wedge
 
Wheel
 
level
a circular lever, usually a wheel with a rope around it.
 
Pulley
 
Wheel and axle
 
Wedge
 
Inclined plane
any device that uses energy to help a person do work.
 
machine
 
power
 
force
 
energy
A rigid bar that pivots or turns around a fulcrum.
 
A lever.
 
A pulley
 
A wheel and axle.
A slanted surface that makes it easier to move an object between a lower level and a higher level.
 
Inclined plane
 
level
 
screw
 
wedge
Any devices made up of more than one simple machine.
 
Complex machine
 
simple machine
 
comply machine
The strength or energy that moves an object.
 
Force
 
machine
The point/area around which a lever pivots or turns.
 
fulcrum
 
lever
 
gear
 
screw
A pin or pole around which a wheel revolves (to go around something).
 
axle
 
wheel
 
pulley
 
lever
When light hits an opaque object a _________ forms on the opposite side of the object.
 
shadow
 
light
 
reflection
Sound is produced when objects ....
 
vibrate
 
move
 
fly
 
travel
Sound can travel when there's no air.
 
False
 
True
Sound doesn't travel all directions.
 
False
 
True
Sound can travel through solid objects.
 
True
 
False
Sound can't travel through water.
 
False
 
True
Which animal uses echoes to find its way in the dark?
 
A bat
 
A cat
 
A rabbit
 
An owl
Most mirrors are made of a sheet of ____________ with a thin coat of _____ on the back
 
polished glass, silver paint
 
unpolished glass, silver paint
 
a rough surface, sand paper
 
polished plastic, gold paint
Using non-renewable energy sources causes ________-and can harm the environment.
 
pollution
 
photosynthesis
 
wind
 
natural disasters
The Sun, wind and water are all __________ energy sources.
 
renewable
 
non-renewable
What does 'run-out' mean?
 
to use all of something and have nothing left.
 
to use something while running outside.
 
to build something outside
 
to run
How long does it take for coal, oil and gas to form (to be made)?
 
millions of years
 
thousands of years
 
billions of years
 
hundreds of years
Coal, oil and gas are called....
 
fossil fuels
 
rocks
 
renewable sources
 
solids
Coal, oil and gas are
 
non-renewable sources
 
renewable sources
Most of our electricity comes from _______________
 
power stations
 
playstations
 
train stations
 
energy stations
Energy can be obtained (taken) from ________ or ___________sources.
 
renewable, non-renewable
 
man-made, natural
 
hot, cold
 
fast, slow


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