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19 Cards in this Set
- Front
- Back
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In order for work to be done, what can you say about the direction of the force compared to the direction of the distance?
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THEY MUST BE IN THE SAME DIRECTION
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What is the equation for work?
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W=F x d
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What is the symbol for work?
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W
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What are the units for work?
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J
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What is another way to write joule?
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N.m or kg.m^2/s^2
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Force applied over a distance is
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WORK
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How well a machine works is
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EFFICIENCY
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What prevents a machine from having 100% efficiency?
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FRICTION
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Why can't a machine have more than 100% efficiency?
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LAW OF CONSERVATION OF ENERGY (ENERGY or WORK CANNOT BE CREATED OR DESTROYED)
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Equation for efficiency
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%eff = Wo/Wi x 100
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Symbol for work output
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Wo
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Symbol for work input
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Wi
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Equation for work output
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Wo=Fo x do
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Equation for work input
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Wi = Fi x di
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The rate of doing work is
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POWER
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The symbol for power is
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P
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The units for power is
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Watts (or W)
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Another way to write watts is
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J/s or N.m/s or kg.m^2/s^3
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What is the equation for power?
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P=W/t
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