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