Position
The location of an object.
Motion
A change in the position of an
object.
Relative position
Position of one object
compared with the position of
another object.
Speed
The rate at which an object
changes position
Force
A push or pull
Friction
Gravity
A contact force that opposes
the motion of an object
A non-contact force that pulls
objects toward each other
Magnetism
A non-contact force that pulls
objects containing iron.
Work
What happens when a force
moves an object over a
distance.
Constant speed
Change position at the same
rate.
Simple machines
Machines that help make work
easier.
Inclined plane
A simple machine consisting of
a slant surface connecting a
lower level to a higher level.
Ramp
Another name for an inclined
plane.
Wedge
A simple machine made up of
two slanted sides that end in a
sharp edge.
Screw
A simple machine that is an
inclined plane wrapped around
a center post.
Lever
A simple machine that is a stiff
bar that rests on a support.
Pulley
Wheel and axle
A simple machine that changes
the direction of motion of an
object to which a force is
applied; has a grooved wheel
that runs on an axle.
A simple machine what allows
someone to pull or push a load
with less force because the
wheel and axle are carrying
more of the weight.