the measure of force that it takes to
move an object a certain distance
Work
a change in position
Motion
the measure of how fast something
moves over a certain distance
Speed
the force that pulls objects toward
each other
Gravity
the measure of the pull of gravity on
an object
Weight
a push or a pull
Force
a tool that helps people do work
Simple machine
a bar that moves on or around a
fixed point
Lever
a flat surface that is higher on one
end than the other
Inclined plane
Screw
Wedge
An inclined plane wrapped
around a cone or cylinder
A machine with a narrow
cutting edge
A grooved wheel with a rope
around it
Pulley
Wheel and axle
A wheel that turns connected to
a rod that turns