Week #8 Quarter 2 (2/2/13- 12/6/13) (calendar site)(calendar site) Monday, 12/2 Have out: Energy Stamp Sheet “Find Someone Who…” Activity Activities/Assignments: 1.Discuss Grades 2.New Energy Stamp Sheet 3.“Find Someone Who…” Activity 4.Make-up work time I.S. Learning Goal: I can describe energy. Daily Question: How does energy go through changes? Homework: ALL WORK DUE DECEMBER 12 TH !!!

Are you a Leader or a Follower??? Leaders  A real leader faces the music, even when he doesn't like the tune. Anon  Before you are a leader, success is all about growing yourself. When you become a leader, success is all about growing others. Jack Welch Follower  You’re unique. Don’t be a follower. Be a leader. Anon  Innovation distinguishes between a leader and a follower. Steve Jobs

Week #8 Quarter 2 (2/2/13- 12/6/13) (calendar site)(calendar site) Tuesday, 12/3 Have out: Energy Stamp Sheet Energy Practice Test Activities/Assignments: 1.Energy Practice Test 2.Energy Assessment Sheet #1 Rubber Band Activity I.S. Learning Goal: I can describe energy. Daily Question: How does energy go through changes? Homework: ALL WORK DUE DECEMBER 12 TH !!!

DATEPAGE #PAGE TITLEDATEPAGE #PAGE TITLE 11/2631 Ionic and Covalent Bonding Review Worksheet 11/27/1332Chemistry Test 12/2/1333 Find Someone Who…Activity 12/3/1334 Energy Assessment Stamp Sheet 12/3/1335Rubber Band Lab12/4/1336 Energy Outline Notes Update Table of Contents

Energy

Shooting Rubber Bands Overview For this introductory activity you will shoot rubber bands stretched to various distances.  Hypothesis: ?  Materials: Rubber Band Ruler Data Table  Procedures: Write a hypothesis on the back of your data table. Place a rubber band on the edge of the ruler, pull it back to 10 cm, and release the rubber band. Be sure the ruler is parallel to the floor. Measure the distance traveled by the rubber band and record it in a data table. Repeat these steps while increasing the distance the rubber band is pulled back by five centimeters for each release. Average your results and create a line graph of your average data with distance traveled on the y-axis and the distance you pulled the rubber band back on the x-axis.

Data Table Trial 10 cm15 cm20 cm25 cm30 cm Average

Questions 1.What patterns or trends did you notice? 2.Was energy used to launch the rubber band? If so, explain your reasoning. 3.What factors could have impacted the accuracy of your data? 4.Did your data support your hypothesis? Explain your reasoning.

Week #8 Quarter 2 (2/2/13- 12/6/13) (calendar site)(calendar site) Wed/Thurs, 12/4 & 12/5 Have out: Energy Stamp Sheet “Find Someone Who…” Activity Activities/Assignments: 1.Energy Assessment Sheet #2 & 3 2.Finish Rubber Band Activity 3.Energy Outline Notes I.S. Learning Goal: I can compare and contrast kinetic and potential energy. I can compare and contrast the different forms of energy (chemical, mechanical, nuclear, thermal, electromagnetic, sound). Daily Question: How does energy go through changes? Homework: ALL WORK DUE DECEMBER 12 TH !!!

DATEPAGE #PAGE TITLEDATEPAGE #PAGE TITLE 12/2/1333 Find Someone Who…Activity 12/3/1334 Energy Assessment Stamp Sheet 12/3/1335Rubber Band Lab 12/4 or 12/5/13 36 Energy Outline Notes 12/4 or 12/5/13 37 Potential and Kinetic Energy Practice Sheet 12/4 or 12/5/13 38 Forms of Energy (Grouping Activity) 12/4 or 12/5/13 39Identify the Form of Energy Worksheet Update Table of Contents

Shooting Rubber Bands Overview For this introductory activity you will shoot rubber bands stretched to various distances.  Hypothesis: ?  Materials: Rubber Band Ruler Data Table  Procedures: Write a hypothesis on the back of your data table. Place a rubber band on the edge of the ruler, pull it back to 10 cm, and release the rubber band. Be sure the ruler is parallel to the floor. Measure the distance traveled by the rubber band and record it in a data table. Repeat these steps while increasing the distance the rubber band is pulled back by five centimeters for each release. Average your results and create a line graph of your average data with distance traveled on the y-axis and the distance you pulled the rubber band back on the x-axis.

Data Table Trial 10 cm15 cm20 cm25 cm30 cm Average

Questions 1.What patterns or trends did you notice? 2.Was energy used to launch the rubber band? If so, explain your reasoning. 3.What factors could have impacted the accuracy of your data? 4.Did your data support your hypothesis? Explain your reasoning.

Energy  the ability to do work or cause changework  typically expressed in units of joules (J)  can be transferred from one object to another  two general types: Potential Kinetic

Potential Energy (PE) stored energy that an object has due to its position or chemical composition Types:  Gravitational – results from vertical position or height Formula: PE = mgh  Elastic – results from stretching or compressing Which soccer ball has more gravitational potential energy? Explain your reasoning. The types listed are not all-inclusive 0.45 kg

Kinetic Energy (KE) energy of motion depends on mass and velocity  Formula: KE = ½ mv 2 increases as mass or velocity increases and decreases as mass or velocity decreases Which soccer ball has more kinetic energy? Explain your reasoning. 2 m/s3 m/s 0.45 kg What is the difference between speed and velocity?

Relationship Between PE and KE PE KE What is happening to the PE and KE as the soccer ball falls to the feet of the mid-fielder? What about the PE/KE graph could be considered misleading?

Practice Problems  A diver weighing 46 kg is preparing for a dive from the 10 meter diving platform. How much gravitational potential energy does the diver have?  A cheetah weighing approximately 50 kg was seen chasing a gazelle at a speed of 32.4 m/s. What is the kinetic energy of the cheetah? KE = 1mv 2 2 (1)_____________ 2 K.E. = (50 kg)(32.4 m/s) 2 = 26,244 J PE = mgh P.E. =(46 kg)(9.8 m/s 2 )= 4,508 J(10 m) Earth’s Gravity

Week #8 Quarter 2 (2/2/13- 12/6/13) (calendar site)(calendar site) Friday, 12/6 Have out: Energy Stamp Sheet “Find Someone Who…” Activity Activities/Assignments: 1.Energy Assessment Sheet #4 & 5 2.Forms of energy worksheet 3.Energy Outline Notes I.S. Learning Goal: I can explain the law of conservation of energy. I can explain the relationship between energy conversions and efficiency. Daily Question: How does energy go through changes? Homework: ALL WORK DUE DECEMBER 12 TH !!!

DATEPAGE #PAGE TITLEDATEPAGE #PAGE TITLE 12/3/1335Rubber Band Lab 12/4 or 12/5/13 36 Energy Outline Notes 12/4 or 12/5/13 37 Potential and Kinetic Energy Practice Sheet 12/4 or 12/5/13 38 Forms of Energy (Grouping Activity) 12/4 or 12/5/13 39 Identify the Form of Energy Worksheet 12/6/1340 Forms of Energy Practice Sheet 12/6/1341Energy Conversion Worksheet Practice Sheet Update Table of Contents

Energy  the ability to do work or cause changework  typically expressed in units of joules (J)  can be transferred from one object to another  two general types: Potential Kinetic

Potential Energy (PE) stored energy that an object has due to its position or chemical composition Types:  Gravitational – results from vertical position or height Formula: PE = mgh  Elastic – results from stretching or compressing Which soccer ball has more gravitational potential energy? Explain your reasoning. The types listed are not all-inclusive 0.45 kg

Kinetic Energy (KE) energy of motion depends on mass and velocity  Formula: KE = ½ mv 2 increases as mass or velocity increases and decreases as mass or velocity decreases Which soccer ball has more kinetic energy? Explain your reasoning. 2 m/s3 m/s 0.45 kg What is the difference between speed and velocity?

Relationship Between PE and KE PE KE What is happening to the PE and KE as the soccer ball falls to the feet of the mid-fielder? What about the PE/KE graph could be considered misleading?

Practice Problems  A diver weighing 46 kg is preparing for a dive from the 10 meter diving platform. How much gravitational potential energy does the diver have?  A cheetah weighing approximately 50 kg was seen chasing a gazelle at a speed of 32.4 m/s. What is the kinetic energy of the cheetah? KE = 1mv 2 2 (1)_____________ 2 K.E. = (50 kg)(32.4 m/s) 2 = 26,244 J PE = mgh P.E. =(46 kg)(9.8 m/s 2 )= 4,508 J(10 m) Earth’s Gravity

Potential and Kinetic Energy Practice Sheet  Complete the Potential and Kinetic Energy Practice Sheet Quietly on your own!  When you are done, raise your hand to receive a stamp.  Be prepared to share answers in class!