Transcript PHYS111_04 - MrLaFazia.com

Conceptual Physics
THURSDAY September 2nd, 2010
LESSON GOALS:
• Turn-in Energy Transformations labquest
• Complete Drinking Bird Lab
• Analyze Drinking Bird (an example of a Heat Engine)
• Brainstorm “Energy” topics
• Organize brainstorming into useful notes
http://mrlafazia.com/PHYS111/lessons/201011Fall/PHYS111_04.ppt
1/10
HWMK Check!
• This homework grade is based on correctness.
• Get out the Energy Transformations labquest and turn it in.
• Next class we will be going over the answers to this
labquest as part of our lesson.
2/10
The Famous Drinking Bird
• Observation: “…you come up with one!...”
• Question, Hypothesis, Experiment, Result w/ Conclusion…
• The main purpose of this lab is to gain practice with using the Scientific Method.
Importantly, this lab experience also helps us to transition into Energy concepts.
• The Drinking Bird is a “thought-provoking stimulus.” In other words, you can ask any
number of questions about it (especially if you can get it to “drink”). Choose an
observation your group makes about the Drinking Bird, and go through the steps of
the scientific method to ask a question, form a hypothesis, and so forth. Each group
has the chance to have a unique approach to this lab exercise.
• Materials needed: drinking bird toy, cup of water; testing environment.
• This lab should be done in groups of 3 or 4.
• On a piece of paper, title your lab “Drinking Bird Lab” and make sure that I can
identify it as your work. This paper will include a record of all lab steps, observations,
and findings and will serve as your lab report (which is turned in for grading at the end
of the class period).
3/10
How the Drinking Bird Works!
• I did not make a fancy graphic animation for this one,
yet…so I will do these notes on the board.
4/10
A Bit of Humor
5/10
Brainstorming
• “What words/phrases do you think of when you hear the word Energy”?
• Here is what the class came up with: (do in groups, first)
Power Heat
Electrical
Nuclear
Sound
Friction
Solar
Wave
Hydroelectric
Kinetic
Fuel
Fossil Fuels
Chemical
Conservation
Potential
Windmills
Combustion
Radiation
Motion
(Non-)Renewable
Photosynthesis
Thermal Energy
Force
Momentum
Phase Change
Stored
Geothermal
Gravity
Mechanical
Work
Microbial (small biology)
Batteries
6/10
Brainstorming Organized!
• Let’s organize your brainstorming into useful notes (with perhaps some additions and
omissions, as necessary)
Definitions:
• Force: A push or a pull…. “a way to transfer Energy”
• Work: Force “times” displacement
• Power: Work done over a period of time
• Efficiency: How well Energy is used to do Work (friction is important!)
• Thermal Energy: Kinetic Energy of particles of a substance (small scale)
• Wave: another way to transfer Energy
Types of Energy:
• Mechanical
• Kinetic Energy (Energy of Motion), Gravitational Potential Energy, and Elastic
Potential Energy (Energy stored in an elastic/springy material)
• Chemical Potential Energy (batteries, explosives, fossil fuels, food; does it burn)
• Electrical (Potential—“Voltage”…Kinetic—“Current”)
• Radiant Energy (Solar, ex. Photosynthesis, “light”)
• Nuclear (fission, fusion, decay processes, other important names)…basically a
change in a nucleus
7/10
Recommended Reading:
Sections 5.7 – 5.12
(Same old same old)
8/10
Poem:
Energy is Boring, by D. LaFazia
I learned today in science class, of the most boring thing!
Energy total does not change, but rather stays the same!
I learned today in science class, of the most boring thing!
Energy total does not change, but rather stays the same!
It may transform by changing type,
Or be transferred from place to place,
But never is it made again, or destroyed...
...which can be a hard fact to face.
It seems that Electrical can be looked at
In this way and in that.
Oh thank goodness that Total Energy,
Has a graph that's always flat!
I learned today in science class, of the most boring thing!
Energy total does not change, but rather stays the same!
I learned today in science class, of the most boring thing!
Energy total does not change, but rather stays the same!
Things that move must have Kinetic,
But it does not stop there.
To be a learned scientist,
Of the Potentials be aware.
I hope that I can keep in mind,
The different things I've learned.
Who ever thought of all these terms,
My thanks has certainly earned!
I learned today in science class, of the most boring thing!
Energy total does not change, but rather stays the same!
I learned so many types and forms, and ways they are the
same!
Good gracious it's a mercy, that Total Energy's so lame!
I now know that an object,
Is not as simple as it seems.
And Thermal is to Kinetic,
As ointments are to creams.
9/10
Looking Ahead:
• Next class we will review the solutions to the Energy Transformations
labquest which was assigned as HMWK #2 (and which you turned in for
grading, today, incidentally).
• We will also begin our quantitative (numbers-based) approach to Energy
Conservation by looking at some useful equations for important Energy
types.
10/10