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http://geekgirlsnetwork.wordpress.com/2009/06/ Energy Transformations
Let’s Review • What are different types of energy you’ve learned about? • Mechanical energy • Potential energy • Kinetic energy • Solar Energy • Thermal Energy • Sound Energy • Chemical Energy • Light Energy • Nuclear Energy • Electrical Energy http://sciencefair.math.iit.edu/projects/forces/
A Question to Ponder • When energy is used by something, what happens to it? • This happens to be the focus question for your lab, so copy it down on a new page in your science notebook. • Answer the question (make sure you explain WHY you think this). • Share in your groups.
Explore • There are six centers set up around the room. • You will have six minutes at each center to make observations about how energy changes. • You will be expected to identify any forms of energy you see, record any changes (transformation) you can find, and illustrate the items at each center.
What Did You Observe? • Center 1 • Flashlight • Center 2 • Light bulb • Center 3 • Car on a ramp • Center 4 • Blowing on a pinwheel • Center 5 • Candle • Center 6 • Tea kettle http://www.faqs.org/photo-dict/phrase/2751/pinwheel.html
So what really happened here? • When the electrical energy was used by the light bulb, where did it go? Was it destroyed? • When the candle burned and you saw the light energy (because I’m quite certain that none of you actually FELT the heat energy), was energy created? http://www.virtual-meditation.com/meditation_room
The answer is no. • You can’t create energy. • You can’t destroy it, either. • The amount of energy you have before a transformation is the same as what exists after a transformation. • It just changes forms, that’s all.
Let’s take a step back. • Go back to your focus question and read your response to it. • What does happen to energy when it’s used by something? • After looking at your observations, write a claim, supported by evidence. • Share your thinking at your table.
Not Everything is Energy • Are the following examples of energy? Why or why not? • Gasoline • Oil • Are these sources of energy, too? • Candy bar • Sleep • Vitamins http://supplements.guidestobuy.com/baby-kids-care/flintstones-complete-childrens-vitamin-chewable-200-tablets/
Something to Think About • Can we “run out” of energy? • If the gasoline in your parents’ car isn’t energy, and we can’t run out of energy, then what is everyone so panicked about? http://jalopnik.com/320417/gas-hits-five-dollars-a-gallon-in-california-the-end-times-draw-ever-more-near
Where does electrical energy come from? • Let’s watch some short videos to find out: • http://www.teachersdomain.org/asset/ket09_vid_coal/ • http://www.teachersdomain.org/asset/phy03_vid_fission/ • http://www.teachersdomain.org/asset/phy03_vid_hooverelec/