Machines, Work, and Energy
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14 Terms
Work
the transfer of energy that results from applying a force over a distance W=Fd
Change in PE
work done while lifting W=mgh
Power
rate at which work is done P=w/t
1 watt
1 joule per second
Machine
a device with moving parts that work together to complete a task
Input
includes everything you do to make the machine work
Output
what the machine does for you
Simple Machines
a mechanical device that accomplishes a task with only one movement - does work because it exerts forces over a distance
Mechanical Advantage
the ratio of the output force to the input force MA = Fo/Fi
Tension
a pulling force that acts along the direction of the rope (tension is the same at every point)
Ramp formula
length/height MA=L/H
Gears formula
Turns output/Turns input = Input # of teeth/Output # of teeth To/Ti = Ni/No
Lever formula
Output force/Input force MA=Fo/Fi
Efficiency formula
E= Work output/Work input
Note 
Flashcards (31)