Transcript Hnrs22 - MrLaFazia.com

Honors Physics
Lesson #22
LESSON GOALS:
• Consider bungee cord “thought lab”
• Group contributions to vocabulary “word wall” post-brainstorming
• Complete lab on Force vs. Displacement (with Spring Scales)
• Complete summary understanding-check
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Conservation of Energy
Imagine that we are going to “work” at pulling a bungee cord
back and thus store “Elastic Potential Energy” in the stretched
Bungee Cord.
The Work on the
bungee cord is done
by an increasing force
as we pull the cord
back.
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Conservation of Energy
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Conservation of Energy
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Conservation of Energy
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Conservation of Energy
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Conservation of Energy
Force
The Force needed to pull
the Bungee back
increases.
The area under
the graph is the
stored Energy
Distance
A Graph of Force versus Distance
shows an increasing Force.
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Group Brainstorming
Before we begin, let us remind ourselves of all of the
terms we have discussed so far in this Energy unit.
Get into groups at the lab tables (these will be your lab
groups, as well, so choose wisely). Then, each group
brainstorm 10 words which we have used up to this
point that relate to the Energy unit.
We are looking for vocabulary words, here!
After a short time of brainstorming, you will then send
up a representative to put up your best word (that has
not yet been given!).
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Force vs. Displacement Lab
In your lab groups, complete the Spring Scale lab.
The PURPOSE of this lab is to help you define the
relationship between Work and Elastic PE.
You will also reinforce the “area beneath the curve”
method of finding Energy stored in an elastic material.
We will be using the lessons learned in this lab for
the next lab: “3-Energy Transformation” (among
others).
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Lesson Summary
Return to your regularly assigned seats.
INDIVIDUALLY, I want you to tell me (in 25 words or
less) the relationship between Work done on an elastic
material and the Elastic Potential Energy stored in that
spring.
When you are done, quietly place it in the Inbox and
return to your seat. Wait patiently until everyone is
done.
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Looking Ahead
• Next class we will continue our discussion on
EPE and how it relates to other forms of
Energy through Energy Conservation.
• The process of Energy Transformation is very
important, here, and considering EPE makes
the upcoming labs a bit more sophisticated.
This is why it is important to understand EPE.
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