1. 1 Student Objective To explain conservation of energy To explain conservation of energy To identify energy conversions To identify energy conversions The rate or speed at which work is done is called _____________ The rate or speed at which work is done is called _____________ Warm Up

2. 2 Reading to Understand Read pgs 158 – 163. Read pgs 158 – 163. In the graphic organizer answer the questions. In the graphic organizer answer the questions. QuestionAnswer 1. What is an energy transformation? 2. What are some examples of transformations between potential and kinetic energy? 3. What is conservation of energy? Hint: Look at pg. 160-161

3. 3 Reading to Understand Questions Check the answers below with yours from your reading Check the answers below with yours from your reading QuestionAnswer What is an energy transformation? An energy transformation is a change from one form of energy to another. What are some examples of transformations between potential and kinetic energy? Juggling and pendulums show transformations between potential and kinetic energy. What is conservation of energy? The law of conservation of energy states that energy cannot be created or destroyed.

4. 4 http://physics.weber.edu/amiri/dir ector/dcrfiles/energy/pendulums. dcr

5. 5 Conclusions: Observe the skier below and the bar charts on the right). What happens to the Potential Energy as the Kinetic Energy increases? Why?

6. 6 Calculating Mechanical Energy (on back of green HW paper in your notes section) The kinetic energy of a 500-N diver during a dive from a 10-m platform was measured. These data are shown in the graph. The kinetic energy of a 500-N diver during a dive from a 10-m platform was measured. These data are shown in the graph.

7. 7 Calculating Mechanical Energy –About 1000 J Reading Graphs: Reading Graphs: –According to the graph, how much kinetic energy does the diver have at 8 m?

8. 8 Calculating Mechanical Energy –Kinetic energy = about 2000 J; potential energy = about 3000 J Calculating: Calculating: –Using the graph, find the kinetic energy of the diver at 6 m. Then calculate the diver’s potential energy at that point.

9. 9 Calculating Mechanical Energy –About 5000 J Inferring: Inferring: –The mechanical energy of the diver is the same at every height. What is the mechanical energy of the diver?

10. 10 BRAINPOP BrainPOP | Science | Learn about Power

11. 11 During our flashlight investigation, although the flashlight’s main purpose is to give off light (electromagnetic energy) it still gave off heat (thermal energy) as well. Click the picture below and view the site to see how forms of energy get transformed into heat (thermal) energy. A thermal infrared image of a ball… What is the balls temperature? More Energy Transformation

12. 12 Conclusions: What did we discover today? Energy can not be Energy can not be Forms of energy are constantly transforming into Forms of energy are constantly transforming into is often a by product of energy transfer (like our flashlight). is often a by product of energy transfer (like our flashlight). created nor destroyed. other forms energy. Heat

13. Finish: CyberEd Physical Science Physical Science Energy & Applications Energy & Applications Properties & Sources of Energy Properties & Sources of Energy Lesson Lesson Click FROG Click FROG Click yellow arrow to skip to Scene 5a Click yellow arrow to skip to Scene 5a Click Read Along arrow Click Read Along arrow 13

14. http://www.science4us.com/SCO/act_67 5/index.aspx?aid=675&cid=P-0 http://www.science4us.com/SCO/act_67 5/index.aspx?aid=675&cid=P-0 http://www.science4us.com/SCO/act_67 5/index.aspx?aid=675&cid=P-0 http://www.science4us.com/SCO/act_67 5/index.aspx?aid=675&cid=P-0 http://www.bbc.co.uk/bitesize/ks3/scien ce/energy_electricity_forces/energy_tran sfer_storage/activity/ http://www.bbc.co.uk/bitesize/ks3/scien ce/energy_electricity_forces/energy_tran sfer_storage/activity/ http://www.bbc.co.uk/bitesize/ks3/scien ce/energy_electricity_forces/energy_tran sfer_storage/activity/ http://www.bbc.co.uk/bitesize/ks3/scien ce/energy_electricity_forces/energy_tran sfer_storage/activity/ http://www.glencoe.com/sites/common_ assets/science/virtual_labs/E04/E04.html http://www.glencoe.com/sites/common_ assets/science/virtual_labs/E04/E04.html http://www.glencoe.com/sites/common_ assets/science/virtual_labs/E04/E04.html http://www.glencoe.com/sites/common_ assets/science/virtual_labs/E04/E04.html http://sciencenetlinks.com/media/filer/2 011/10/07/powerplay.swf http://sciencenetlinks.com/media/filer/2 011/10/07/powerplay.swf http://sciencenetlinks.com/media/filer/2 011/10/07/powerplay.swf http://sciencenetlinks.com/media/filer/2 011/10/07/powerplay.swf http://www.learner.org/workshops/ener gy/cattraption/catrunthru.html http://www.learner.org/workshops/ener gy/cattraption/catrunthru.html http://www.learner.org/workshops/ener gy/cattraption/catrunthru.html http://www.learner.org/workshops/ener gy/cattraption/catrunthru.html 14

15. 15 http://www.glencoe.com/sites/common_assets/scie nce/virtual_labs/E04/E04.html http://www.glencoe.com/sites/common_assets/scie nce/virtual_labs/E04/E04.html http://www.glencoe.com/sites/common_assets/scie nce/virtual_labs/E04/E04.html http://www.glencoe.com/sites/common_assets/scie nce/virtual_labs/E04/E04.html http://sciencenetlinks.com/media/filer/2011/10/07/ powerplay.swf http://sciencenetlinks.com/media/filer/2011/10/07/ powerplay.swf http://sciencenetlinks.com/media/filer/2011/10/07/ powerplay.swf http://sciencenetlinks.com/media/filer/2011/10/07/ powerplay.swf http://www.learner.org/workshops/energy/cattrapti on/catrunthru.html http://www.learner.org/workshops/energy/cattrapti on/catrunthru.html http://www.learner.org/workshops/energy/cattrapti on/catrunthru.html http://www.learner.org/workshops/energy/cattrapti on/catrunthru.html http://www.bbc.co.uk/bitesize/ks3/science/energy_ electricity_forces/energy_transfer_storage/activity/ http://www.bbc.co.uk/bitesize/ks3/science/energy_ electricity_forces/energy_transfer_storage/activity/ http://www.bbc.co.uk/bitesize/ks3/science/energy_ electricity_forces/energy_transfer_storage/activity/ http://www.bbc.co.uk/bitesize/ks3/science/energy_ electricity_forces/energy_transfer_storage/activity/ http://www.science4us.com/SCO/act_675/index.as px?aid=675&cid=P-0 http://www.science4us.com/SCO/act_675/index.as px?aid=675&cid=P-0 http://www.science4us.com/SCO/act_675/index.as px?aid=675&cid=P-0 http://www.science4us.com/SCO/act_675/index.as px?aid=675&cid=P-0 Energy Transformations HW Energy Transformations HW