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15 Cards in this Set
- Front
- Back
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Work
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Work = f x d
Measured in Joules |
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Power
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Power = w/t
Measured in Watts |
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GPE
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GPE = mgh or wh
Measured in: weight= newtons mass= kg g= m/s2 |
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Ke
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Ke = 1/2mvsquared
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Conservation of Energy
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Total energy = Ke + GPE
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Which requires more power, walking up the stairs or running up the stairs? Explain.
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Running because it takes less time. The faster you go the more power you use.
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directly proportional
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If A increases then B increases
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inversely proportional
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If A increases then B decreases
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Power and work are.....
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directly proportional
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Power and time are....
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inversely proportional
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How much power is needed if a 100 N barbell is lifted 2m in 5 secs? 10 secs?
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power = 40 watts
power = 20 watts |
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energy
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the ability to do work
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normal force
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-acts on any object that touches surface
ex. a ball on a table -acts perpendicularly to the surface. |
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Potential Energy
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Stored energy
ex. Chemical (Food, batteries) ex. Elastic (stretchy) ex. GPE (in the air) |
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How high would you need to raise 10 kg of water to get 500 J of GPE
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height = 5 meters
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