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