# force mass speed gravity

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force
a push or
a pull
mass
effects the amount of
force you must use to
move an object
speed
the measure of how fast
something
moves over
a certain
distance
gravity
the force that pulls
objects toward each
other
weight
the measure of the
pull of gravity on an
object
energy
is needed to do work
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friction
is created
when two
objects rub
against each
other
What causes
motion?
a push or a pulling
force
What is motion?
a change in position
What is the force
that pulls us to
Earth?
gravity
What is work?
when you use force
to move something
What do simple
machines do?
make work
easier
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Name the six
simple machines
What is a
wedge?
What is a pulley?
What is a screw?
What is an
inclined plane?
What is a wheel
&amp; axle?
wheel and axle,
lever, pulley, inclined
plane, wedge, screw
Two inclined planes put back
to back; it can
tighten, split, or hold
objects (like an ax or
door stop)
A rope wrapped
around a grooved
wheel; it changes
the direction of the
force needed
an inclined plane
wrapped around a
post; it helps hold
and raise objects
A flat surface set at an angle;
it helps you lift or
move objects up
(examples: ramp,
It is a wheel on a rod or axle;
it helps you move
things with less
force
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What is a lever?
What is a
compound
machine?
What are gears?
Do simple
machines
change the
amount of work
to be done?
It is a bar that moves on or
around a fixed point called a
fulcrum (examples:
see-saw and
hammer)
Two or more simple machines
put together
(like scissors)
Wheels with jagged edges
like teeth
No—they just make
the work easier (can
use less force)
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