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Introduction to Energy

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by

Chris Bergmann

on 15 April 2014

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Transcript of Introduction to Energy

Welcome to the Study of ENERGY!
Introduction
Make a new entry in your journal (To-Do)
Draw the picture to the right...
Write a detailed paragraph describing everything you may already know about a pendulum and how it works based on the things you learned from our last unit (Physics).
Make a WORD SPLASH using short terms and phrases to predict what we MIGHT learn about pendulums and their connection to the study of ENERGY.

BIG QUESTION:
What impact and influence does energy have on...
YOU- ?
SOCIETY?
ECONOMICS- ?
ENVIRONMENT- ?
HISTORY- ?
Energy in Action
Who is Rube Goldberg?
Read Page 3-7 and then watch the videos to complete the activity on page 9.
Six Forms of Energy
1. Mechanical
2. Chemical
3. Radiant (E-M)
4. Thermal (heat)
5. Electrical
6. Nuclear
Classifying Energy
After watching examples of energy transfer in action, how would you classify and group different "Forms of Energy"?
Interactive Journal Notes
Task:
Use the yellow article at your desk to analyze the 6 forms of energy.

Requirements:
Must be "interactive" and demonstrate "high quality work"

Each element (category of energy) must include:
Definition
Picture/Visual
Real World Example(s)
Energy Transfer Analysis
Task: Re-watch and analyze the Mythbuster's Rube Goldberg Machine to outline all of the energy transfers that take place in the video (see example below).
Adam pulls the string on a bottle of Coke
1.
Mechanical
Mentos and Coke mix to erupt!
2.
Chemical?
Mechanical?
3.
?
?
Observatation/Action
Type of Energy
Chemical
Nuclear
Mechanical
Thermal
E-M Radiation
Electrical
Energy Scavenger Hunt...
Conservation of Energy
States of Energy
Potential Kinetic
Potential Energy = stored energy (PE)
Not moving, but potential to move
Calculating Gravitational Potential Energy
PE=(mass)(gravity)(height) OR PE = mgh
ENERGY DEMO ANALYSIS!
Law of Conservation of Energy
Energy cannot be created or destroyed
Energy can be transferred...
Between objects in a system
Switch forms
Total energy is always conserved
The ability to do work.
EVERYTHING = ENERGY
The amount of energy in the universe is CONSTANT!
All energy comes from the sun!
Def: Energy in bonds of molecules that transform substances into something new
Def: Traveling electromagnetic waves that are reflected and/or absorbed
Def: Internal vibration of particles (temperature)
Def: Movement or flow of electrons - charge (+) (-)
Def: Energy of motion and an objects position in gravity
Def: Energy that comes from the nucleus of an atom - (Fusion and Fission)
Joining together of nucleus
Splitting of atomic nucleus
Kinetic Energy = energy in motion (KE)
Active energy
Calculating Kinetic Energy (mechanical)
KE = 1 mv OR KE = m(v )
2
2
2
__
2
_____
How energy exists in nature...
Energy can transfer from PE to KE and from KE to PE
Like a see-saw battle (as one gains, the other loses)
100% of PE can transfer to 100% of KE
You can never gain more energy than you started with unless you add more force!
Ex. If total energy = 100% at all times and a pendulum has 75% PE, then it must have _____% KE

PE + KE = Total Mechanical Energy
?
ADVANCED:
If 100% of PE converts to 100% KE
Then
PE = KE
mgh = 1/2mv
Can you predict the
velocity
of an object based on its height?
v = 2 g h
2
Name of Demo

Prediction:
What do you think will happen?

Observation:
What actually happened?

Analysis:
What can we learn from this? (answer questions)


Euler's Disk
Playful Penguins
Top Secret Top
Bowling Ball Pendulum
1. Does the total amount of energy in the swinging pendulum change?

2. How are PE and KE related?

3. When the PE is very high, is it possible for the KE to be very high as well?

4. When the pendulum has a KE of 82% of the total energy, what would you assume the PE of the pendulum to be?

Physics Place Pendulum
1. What form(s) of energy are occurring here?
2. Make a prediction: Why doesn’t the top stop? :-)

1. What state of energy do the penguins acquire as they climb?

2. What state of energy do the penguins acquire as they slide down the track?

3. What is doing the work as the penguins slide down the track?

4. The D cell battery that powers the toy contains/provides what type(s) of energy?

5.The penguins can climb due to energy supplied by the batteries. What part of the toy does the work in this energy transition?

6. The tiny speaker generating the “squeak” is an example of what type of energy?

7. Energy is conserved in a closed system. Does all of the battery energy go into raising the penguins? Why or why not?

8. Is the energy the penguins “acquire” by climbing to the top of the ladder equal to the total amount of energy at the bottom of the track? Why?

9. Friction can do work. Lists all places that friction exists in this toy.

10. Are the penguins at their “terminal velocity” when sliding down the track? How do you know?


1. What type of energy is occurring here?

2. What state of energy is occurring here?

3. Does the disk gain energy as it falls? Support your answer with your thoughts about conservation of energy.

4. When the disk starts, does it have more potential energy or kinetic energy?

1. Will this demo hurt? Explain your answer using the Law of Conservation of Energy.
Full transcript