Physics - Chapter 11: Work and Machines
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Last updated 2:45 AM on 1/25/23
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28 Terms
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work
the transfer of energy from one body to another; an effort that produces motion
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Joule
the SI unit of work
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Foot pound
the U.S. Customary unit of work
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W \= Fd
equation for work (horizontal)
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W\= Fdcos(theta)
Equation for work ( angled)
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net work
the sum of positive and negative work
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negative work
force applied opposite to motion
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power
the time rate of doing work
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p \= W/t
power \= work/time
power \= work/time
equation for power
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Watt
SI unit of power
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horsepower
method of stating power that has no system of unts
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1 hp \= 550 ft.lbs.
1 horsepower to ft. lbs.
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fulcrum
the pivot point of any lever
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F(i) r(i) \= F(o) r(o)
Law of levers
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mechanical advantage
the ability of a machie to multiply force
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actual mechanical advantage (AMA)
the ratio of output to input force
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ideal mechanical advantage
what mechanical advantage would be if there were no energy losses due to friction or other causes
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IMA
the ratio of input to output distance
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IMA
which is greater IMA or AMA
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Class 1 Lever
the output/ load and the input force are on opposite sides of the pivot point
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Class 2 Lever
Output force is between input force and fulcrum
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Class 3 Lever
the input is betweenn the fulcrum and output/load
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yessir
Know examples of levers on page 165
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IMA\= 2(pi)(r) / pitch
IMA equation for a screw
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Block and tackle
a series of pulleys working in combination with each other
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Wheel and axle
the simplest machine that can be considered a rotary lever
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Torque
forces that cause rotation
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efficiency
defined as the output work divided by input work or (AMA/IMA)
Note 
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