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Definition of work
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Work and Power

7th grade Work and Power

QuestionAnswer
Definition of work Using a force to move an object through a distance in the direction of the force.
What is force? a push or a pull, also defined as mass x acceleration
What force pulls objects down? gravity
What force, from gravity, is a measure of how much an object is pushing down on the ground (or whatever they are on)? weight
formula for work force x distance
unit label for force N or Newtons
unit label for work J or Joules (equal to N x m/s/s)This is the same as for energy.
unit label for energy J or Joules (same as for work)
unit label for power W or Watts (equal to J/s)
SI unit for time s or seconds
SI unit for distance m or meters
formula for power Energy/time or Work/time
What is the purpose of a formula? to help you know which numbers to use and what to do with them
When can there be force and motion, but you cannot calculate the work? When the motion is not in the direction of the motion.
When can energy be used without doing work? When there is no motion (or none in the direction of the force).
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.
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.
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.
Created by: TBraunsdorf
 

 



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