ipc ch.14
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the product of force and distance
work requires …
motion
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21 Terms
work
the product of force and distance
work requires …
motion
work depends on …
direction
work formula
w=Fd
Si unit for work
joule (J)
power
the rate at which work is done
Si unit for power
watt (w)
power formula
P=w/t
1 horsepower=
about 746 watts
machine
a device that changes a force, help do work
input
what the person does
output
weight, what your trying to accomplish
mechanical advantage
the number of times the machine increases an input force
due to friction
actual mech. adv. is less than ideal mech. adv.
force is given
actual mechanical advantage, MA
distance is given
ideal mechanical advantage, IMA
actual mechanical advantage formula
MA= Fout/Fin
ideal mechanical advantage
the mechanical advantage in the absence of friction
ideal mechanical advantage formula
IMA= Din/Dout
efficiency
the percentage of work input that becomes work output
efficiency formula
E= Wout/Win = %/100