7th grade Work and Power
Help!
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| Definition of work | Using a force to move an object through a distance in the direction of the force.
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| What is force? | a push or a pull, also defined as mass x acceleration
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| What force pulls objects down? | gravity
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| What force, from gravity, is a measure of how much an object is pushing down on the ground (or whatever they are on)? | weight
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| formula for work | force x distance
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| unit label for force | N or Newtons
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| unit label for work | J or Joules (equal to N x m/s/s)This is the same as for energy.
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| unit label for energy | J or Joules (same as for work)
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| unit label for power | W or Watts (equal to J/s)
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| SI unit for time | s or seconds
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| SI unit for distance | m or meters
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| formula for power | Energy/time or Work/time
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| What is the purpose of a formula? | to help you know which numbers to use and what to do with them
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| When can there be force and motion, but you cannot calculate the work? | When the motion is not in the direction of the motion.
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| When can energy be used without doing work? | When there is no motion (or none in the direction of the force).
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| If you are trying to find the work and have 10 km as the distance, what is the first step? | Change the distance of 1 km to 10,000 m.
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| If you are trying to calculate power, and the time is 1 hour, what do you need to do first? | Change the 1 hour to 3600 s.
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| Which of these is not needed in calculating work? 10 m, 5 s, 15 N | 5 s, because seconds are a measure of time, and not of force or distance, which are used to calculate work.
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Created by:
TBraunsdorf