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Glossary of science machinesss

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Created by Ivana

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a unit of work
joule
an ideal machine has an efficiency of
100%
a machine makes work easier by
changing the direction of the force needed to do the work
an axe, a zipper, and a front tooth all act as a
Wedge
calculating if you divide the radius of a wheel by the radius of an axle
the ideal mechanical advantage of the wheel and axle
fixed point that a lever rotates around
fulcrum
use to form a compound machine with one wheel and axle linked to another wheel and axle
gears
compound machine
a combination of simple
in order for work to be done on an object the object must
move as a result of your force
the number of times a force is exerted in a machine is multiplied by a machine
mechanical advantage
on a screwdriver the handle is the wheel the shaft is the
axle
muscles are attached to bones by
tendons
the more efficient a machine is the closer the actual mechanical is to the
ideal mechanical advantage
an inclined plane wrapped around a central cylinder
screw
a rope wrapped around a wheel
pulley
a single fixed pulley like we find on a flagpole
changes the direction of the input force
when you bite into a sandwich your teeth are working as
wedges
does a machine decrease the amount of work you do?
it DOES NOT.
you can do 1200 joules of work and the screwdriver does 900 joules of work. what is the efficiency?
75%
bend your arm at the elbow, where is the fulcrum in
elbow

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