February 8, SWBAT explain the difference between potential and kinetic energy. How will you help our class earn all of our S.T.R.I.V.E. Points?

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1 February 8, 2017 Aims: SWBAT explain the difference between potential and kinetic energy. Agenda 1. Do Now 2. Class Notes 3. Guided Practice 4. Independent Practice 5. Practicing our AIMS: Homework: E.2 PE v KE How will you help our class earn all of our S.T.R.I.V.E. Points? Who said it?!? 100% HW Club.you in?!?! 1

2 Aim Check: Dr. MAE C. JEMISON: Astronaut, Doctor (1956 ) 1992, she flew into space aboard the Endeavour During her eight days in space, she conducted experiments on weightlessness and motion sickness on the crew and herself. 2

3 SCIENCE 8 PE v KE E.2 Name: Date: Homeroom: Energy I have POTENTTIAL! I just haven t converted it yet OBJECTIVES: By the end of class, students will be able to SWBAT explain the difference between potential and kinetic energy. DO NOW Directions: Read and ANNOTATE the question before you solve the problem. READ LIKE A SCIENTIST! 1. Find the facts: ANNOTATE 2. Find the patterns: Sort the facts, what do they have in common? 3. Find the take-away: What do you now understand? What should a SCIENTIFICALLY LITERATE person take away from this? Issue Overview: Solar energy Bloomberg, adapted by Newsela staff Solar power comes from the sun. It can be collected using large plates called solar panels. As the light hits them, they make electricity. Without electricity, machines would not work. Solar panels used to cost a lot and not make much energy. Over time, the price has gone down. In some places, solar energy is as cheap as fossil fuels. These are materials like coal and gas. They are cheap, but they cause pollution. A big problem is keeping electric power running. When it is dark or cloudy, solar panels receive no sunlight. They can't make electricity. The Situation Solar is a form of renewable energy. Other forms are water and wind. Sunlight, water and wind are not consumed after they are used. But coal and gas are not renewable. They are burned to make electricity. In the U.S. all states have to lower their carbon emissions. This means they have to use less fossil fuel. China and Japan are building many more power plants. India promised to spend millions of dollars. Even companies like Apple want to use solar power. The Background The first solar panel was made in the U.S. By the 1990s, Japanese companies were making panels for the world. By 2004, Germany led the world in solar panel 3

4 manufacturing. Eventually, solar energy companies started competing with each other. As a result, the price dropped. Some of these companies had to close. In China, companies have built giant factories. They sell many solar panels around the world. The government helped pay for them. Foreign investors also gave China cash. This way, solar power companies stayed open. The Argument Greenpeace is a group that wants to protect the planet. It says there is enough solar power for the whole world. Others are not so sure. Some say that solar could make a quarter of the world s electricity. This will only happen if the right laws are in place. Others say that solar power costs too much. Solar power also needs constant sunlight to work. In the long run, solar power will become cheaper. It will certainly be cleaner. Right now, scientists are hoping for a breakthrough. They want to find a way to store solar power. Then people will be able to use it when it is cloudy and at night. Did you find the facts: ANNOTATE? Now, Find the patterns: Sort the facts in the space below, what do they have in common? Finally, find the take-away: What do you now understand? What should a SCIENTIFICALLY LITERATE person take away from this? 4

5 TYPES OF ENERGY CLASS NOTES POTENTIAL ENERGY: DEPENDS on its and its. Found in 9 th grade notes: KINETIC ENERGY: Depends on and Found in 9 th grade notes: COMPARE AND CONTRAST! 5

6 ENERGY IN DISGUISE! energy is into energy when an object goes from is to when an object that is 6

7 GUIDED PRACTICE Evaluate whether the example given is of potential or kinetic energy. Then explain which of the two objects listed has MORE energy, and explain why. Use ICE and scientific terms to justify your reasoning. 1. A 900g book sits on top of Nate s desk, and Jeremiah stands holding another 900g book above his head: 2. Two 1800kg cars head down the street, one at 30 mph and one at 45 mph: 3. A 1800kg car and a 2200kg truck head down the highway at 65mph: 7

8 INDEPENDENT PRACTICE Directions: For each key term, explain the big idea to a kindergartener. Then, draw a picture to illustrate the word. Term Concept Picture Potential Energy Kinetic Energy CHECK YO SELF: Write whether each scenario is an example of kinetic or potential energy. 1. A football is thrown by Demetrias and caught by Lamont for a touchdown: 2. Sarah runs to be first in line at recess: 3. A bicycle sits outside Kia s front porch: 4. A car waits at a red light: 5. Durrell sits on his couch watching the Wolverines (he lost a bet with Salio): 6. Marcus sits on Raul s desk: 7. Kedar is reading in her chair: 8. A rollercoaster car sits at the top of its highest peak: 8

9 Directions: Evaluate whether the example given is of potential or kinetic energy. Then explain which of the two objects listed has MORE energy, and explain why. Use ICE and scientific terms to justify your reasoning kg Kevin Garnett and 116kg Tim Duncan wait at center court for a jump ball: 10. Ms. Fagan s 5kg dog and Ms. Schranz s 25kg dog play together in the back yard: 11. Joe and Juan have the same mass. Joe stands by the bathrooms, while Juan stands by the cafeteria: 12. Two 1900kg cars drive down the highway. Car A is traveling at 72mph and Car B is traveling at 68mph: 9

10 13. Two laptops are in KSU, one is on the ground (!) and the other is on Mr. Searles cart: Directions: In the examples below, decide whether kinetic energy is being transformed into potential energy, or if potential energy is being transformed into kinetic energy. Use ICE and scientific terms to justify your reasoning. 14. A car accelerates as a light turns from red to green: 15. A book hits the ground after falling from Damya s desk: 16. A child on a swing slows down as she reaches the highest point: 17. Ms. Hughes slows down crossing the finish line after beating all the 8th graders in a race: 18. A football lands in Armani s hands after he intercepts a pass from Herman: 10

11 Mr. Searles <3 s SCIENCE! The student pulled the cart across the table five times. Each time, the student used more force. Force is measured in Newtons (N) on the spring scale. The student then calculated the acceleration of the cart, measured in meters per second squared (m/s2). The results are shown in the data table. Data Table Force (N) Carts Acceleration (m/s 2 ) Use Newton s 2 nd Law to determine the mass of the cart. Based on the graph, predict the acceleration of the cart if the student were to perform the same experiment again using 5.2 N of force. 11

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13 Science 8 Name: SKILL SNAPSHOT Date: E.2: PE v KE Homeroom: Quick Notes: Read and ANNOTATE the information before you solve the problem. Like A Scholar? Yes No Redo? Yes No Directions: Support your selection by finding evidence to support your answer OR evidence to support why another is incorrect. Be sure to include at least one scientific term in your evidence Question 1. Potential energy is energy Supporting evidence A. dependent on mass and velocity. B. dependent on time and velocity. C. dependent on time and position. D. dependent on mass and position. 2. Kinetic energy depends on A. mass only B. height C. velocity only D. mass and velocity 3. Which of the following is an example of only potential energy? A. A dog chasing a ball B. A child roller skating C. A car at a red light D. A book falling from a desk 4. Which of the following is an example of kinetic energy? A. A car at a red light B. A car traveling on the highway C. A person at the top of a staircase D. A pencil on a desk 13

14 5. Ms. Huber finds Chemistry Cat memes amusing, but that s not why he s on the homework. Use your knowledge of potential and kinetic energy to determine why she finds this meme to be clever. Use ICE to help support your reasoning. Question 6. CONCEPT REVIEW Supporting evidence 14