Download Chapter 12: Work and Energy

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Work and Power
What is Energy?
Conservation of Energy
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What is work?
◦ A force through a distance.
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Is it work?
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You sitting in class.
A person shot putting.
Picking up your phone.
The Hulk throwing Loki around
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Individually write down five examples of work
and five examples of non-work.
After I tell you to share your examples with
your partner.
Then we will bring it up as a class.
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Work as stated is a force through a distance.
◦ W=Fxd
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The units for work are the joule.
◦ N x m= J
◦ Unit for all types of Energy
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Imagine a father playing with his daughter by
lifting her repeatedly in the air. How much
work does he do with each lift, assuming he
lifts her 2.0 m and exerts an average force of
190 N?
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Page 379 p. 1-5
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Running up a flight of stairs doesn’t require
more work than walking, but it is more
exhausting.
The unit used to measure work in relation to
time is called power.
Power = work/time
P=w/t
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Power is measured in watts (W)
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Pg. 381 #1-5