Period 2: Conservation of Energy Demonstration
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Period 2: Conservation of Energy Demonstration
- 1. Question of the Day
- 2. Question of the Day
- 3. Today’s Objectives: • You will be able to describe the Law of Conservation of Energy. • You will be able to trace the movement of energy through simple examples.
- 4. The Law of Conservation of Energy • The total energy of an isolated system remains constant. • Energy can be neither created nor destroyed. • Energy can transform from one form to another.
- 5. The Law of Conservation of Energy • The total energy of an isolated system remains constant. • Energy can be neither created nor destroyed. • Energy can transform from one form to another.
- 6. The Law of Conservation of Energy • The total energy of an isolated system remains constant. • Energy can be neither created nor destroyed. • Energy can transform from one form to another.
- 7. Conservation of Energy Demonstration
- 9. Additional Practice: • Read p. 83 – 84 • # 6.8
Editor's Notes
- The answer is D. This question is taken from paper 11 of May/June 2011.
- The answer is D. This question is taken from paper 11 of May/June 2011.
- Sound energy and air resistance (heat) can also be introduced during this slide. Image from: http://www.eoht.info/page/Conservation+of+energy
- How is energy transformed inside of your phone? (Chemical Electrical Sound / Light / Kinetic (Vibrations) / Heat (Hopefully not too much) Images from: http://www.techradar.com/reviews/phones/mobile-phones/iphone-6-plus-1264566/review http://www.beijingiphonerepair.com/news/my-iphone-wont-charge-quick-and-easy-fix/
- What happens when the battery dies? (The phone stops working, you need to transfer more energy by charging it.) Images from: http://www.techradar.com/reviews/phones/mobile-phones/iphone-6-plus-1264566/review http://www.beijingiphonerepair.com/news/my-iphone-wont-charge-quick-and-easy-fix/ http://www.recoveriphonebackup.com/category/uncategorized
- This demonstration includes a large pendulum. It was created by drilling a hole into a bowling ball, attaching a eyebolt, and securing it to the ceiling with a sturdy length of rope. A smaller pendulum would also work, but be less exciting. The setup should be thoroughly checked before students arrive to make sure that it is safe. At the end of the demonstration and questioning, students can try to drop it. Make sure that their heads are resting against an unchanging surface so that they do not accidentally move their heads forward. Another important aspect of this demonstration is guiding the students with questions. Some example questions include: 1. (When the ball is hanging, before it is dropped.) What type of energy does the ball have? How do you know that? (Gravitational, it is above the ground.) 2. If we image that the rope is unbreakable, can the ball go any lower? Let’s define the bottom of the ball as the bottom of the system, what type of energy does it have now? (No, none.) 3. If I pick the ball up, what is happening to the energy? How can it increase if energy is conserved? (It increases, you do work to transfer energy into the system.) 4. What type of energy does it have now? What percentage is gravitational energy? (Gravitational, 100%) 5. Watch the very bottom point as I release it. What time of energy does it have when it 6. What type of energy does it have on the other side? (Gravitational) 7. How does that height on the far side compare to the height on the initial side? How does the gravitational potential energy at the far side compare to the initial side? (Same, same) 8. As it is halfway down, what type of energy does it have? How much of each type? (Gravitational & kinetic energy, about 50% of each) 9. If it doesn’t rise to the exact same starting position, does that mean that the Law of Conservation of Energy is false? Why not? (No, some energy to transferred to the air due to air resistance.) 10. If I drop it from in front of my face and no additional energy is added, what do you expect will happen? (It shouldn’t rise up any higher or hit you.) If I push it initially, transferring in energy as work, what will happen? (It will rise higher in the end and hit you – make sure to move out of the way.)
- If energy is conserved, why did the ball go higher? (It didn’t.) What went wrong? (She moved her head forward.) Video from: https://www.youtube.com/watch?v=CN3yCdqaSIY
- The additional practice can be found in the Cambridge IGCSE Physics (Second Edition) written by David Sang. More information about this coursebook can be found here: http://education.cambridge.org/as/subject/science/physics/cambridge-igcse-physics-%28second-edition%29/cambridge-igcse-physics-coursebook-with-cd-rom-%28second-edition%29