using machines
a machine _______ the way in which work is done
changes
although a machine makes work easier, it does not ______ the amount of work required
decrease
as the output force exerted by any machine _______ the output distance ________
decreases, increases
a machine can make it easier to do work by changing the ______ of the input force
direction
a machine can make it easier to do work by changing the _______ over which the force acts
distance
ratio of output work to input work
efficiency
the ______ if a machine is the ratio of the output work to the input work
efficiency
a mechanical advantage equal to 1 means the input force and the output force are _______ but the direction of the input force ______
equal, changes
a machine can make it easier to do work by changing the size of the _____
force
to use a machine you must apply a _______ to it
force
a mechanical advantage ________ than 1 means the output force is greater than the input force
greater
a machine can change an _____ force into a large _______ force
input, output
machines convert ______ work to _______ work
input, output
the machine changes the _______ force to a _____ force
input, output
when a hammer removes a nail the ______ comes from pulling on the hammer's handle; the hammer changes this to a ___________ that pulls the nail from the board
input, output force
a mechanical advantage ________ than 1 means the output force is less than the input force
less
because the output work is always _____ that the input work the efficiency of a machine is always _____ than 100 percent
less, less
a ______ is any device that makes doing something easier
machine
a machine's _________ is the ratio of the output force produced to the input force applied
mechanical advantage
ratio of output force to input force
mechanical advantage
when you use a machine, the input force makes part of the machine _____
move
with a rake you hands move through a ______ distance, but the other end of the rake moves through a _______ distance
short, greater
the output force acts over a ______ distance that the input force does
shorter
a machine can make work easier in _____ different ways
three
_____ is done because the input force causes movement
work
the output work done by a machine never exceeds the input _____ of the machine
work