work
force X distance
power
work (force X distance) divided by time
work (science definition)
using force to move an object a distance
joules
unit used to measure work
watts
unit used to measure power
mechanical advantage
ratio of output force divided by input force
simple machines
a device that helps make work easier
lever
straight bar or rod that turns on a pivot point (fulcrum)
inclined plane
a ramp
screw
holds things together
wheel & axle
reduces the friction of moving something
pulley
something that uses a rope and can change the direction of a force
wedge
can split an object apart
efficiency
the ratio of the output work to the input work
fulcrum
the point about which a lever pivots