The Restless Life of Ach Two O : How Energy Moves Water around on the planet Perfecta.

1. The Restless Life of Ach Two O: How Energy Moves Water around on the planet Perfecta. Directions: Step 1: Read the story of The Restless Life of Ach Two O (page 1 & 2). Step two: Go to www.tonkaunit9energy.weebly.com Select the Potential and kinetic Energy tab. Complete the notes for pages 4 and 5 as you watch the videocasts. Step 3: Using the Law of Conservation of Energy, complete the practice on pages 6 – 11. Step 4: The last page describes the padlet posting that you need to do to earn a Quiz Score!! A link to the padlet is proved on the the website.

2. In a galaxy far, far away, there is a planet called Perfecta that is identical to Earth in every wayaccept one. The laws of Physics that apply on Earth also apply on Planet Perfecta. The gravitational field of Perfecta is the same as Earth’s. The hydrology (water) cycle is the same as Earth’s. The Law of Conservation of Energy is the same on Perfecta as it is on Earth (but you knew that be cause the Law of Conservation of Energy is true everywhere in the universe). The Law of Conservation of Energy states that energy cannot be created or destroyed, it simply changes form. So if you start with a certain amount of energy in a system, it stays the same. It can shift around to different types, but the total is the same! Kinetic Energy (motion) Gravitational Potential Energy (height) Thermal Energy (heat) Radiant Energy (light) Elastic Potential Energy (stretching or squishing) 1 The Restless Life of Ach Two O: How Energy Moves Water around on the planet Perfecta.

3. The only way that Perfecta is different than Earth is based on Energy Transfers. All Work transfers to Energy. All Energy transfers to Work. On Earth, when energy is transferred, some of it is ‘lost’ - Since the Law of Conservation of Energy says Energy can never be created or destroyed, earthlings have it wrong when they say Energy is ‘lost’. What they mean is that Energy is changed to a form that Earthlings cannot use easily (like engine heat or friction). On Planet Perfecta, no energy is ever changed to a form that Perfectants can’t use - no energy is ‘lost’ on Perfecta. When Work is done on Ach Two O (an object) , the energy stored in Ach Two O (an object) is equal to the Work done on it. When Work is done by Ach Two O (an object) , the energy released is equal to the work done by Ach Two O (an object) . On Planet Perfecta, the water cycle is based on energy transferring between only two types of energy: Gravitational Potential Energy And Kinetic Energy 2 The Restless Life of Ach Two O: How Energy Moves Water around on the planet Perfecta.

4. Perfect Energy Transformations 3

5. Gravitational Potential Energy (height) The Restless Life of Ach Two O: How Energy Moves Water around on the planet Perfecta. Kinetic Energy (motion) 4

6. Height: 800 m Mass: 0.02 kg Find the Gravitational Potential Energy of Ach Two O: EGRAV = m g h How much Energy will Ach Two O have at any point as it falls? How do you know? 5 The Restless Life of Ach Two O: How Energy Moves Water around on the planet Perfecta.

7. Height: 800 m Mass: 0.02 kg Find the velocity of Ach Two O right before it hits the surface: Ek = 1/2 m v2 How much Energy will Ach Two O have at any point as it falls? How do you know? 6 The Restless Life of Ach Two O: How Energy Moves Water around on the planet Perfecta.

8. A B C D 7

9. Finding Energy transformations on Perfecta • Use the picture on the previous page for the reference points mentioned in the questions below. Assume Ach Two O has a mass of 0.02 kg. • If the energy of Ach Two O is 450.0 joules at D right before it hits the surface, how much Gravitational potential Energy (EGRAV) will it have at A? • Find height of Ach Two O at A. • Will the Gravitational potential Energy (EGRAV) of Ach Two O be more or less at B than at A? • How fast will Ach Two O be travelling at D right before hitting the surface? 8

10. Finding Energy transformations on Perfecta (Continued) • Use the picture on the previous page for the reference points mentioned in the questions below. Assume Ach Two O has a mass of 0.02 kg. • What will happen to the Gravitational potential Energy (EGRAV ) of Ach Two O as it moves from • A to B? • B to C? • C to D? • What will the Mechanical Energy of Ach Two O be at B? At D? At C? At A? • Why? • How much of Ach Two O’s energy at A is Gravitational potential Energy (EGRAV )? • Draw a pie graph that shows how the Gravitational potential Energy (EGRAV ) of Ach Two O changes as it moves from A to D. • A B C D 9

11. Finding Energy transformations on Perfecta (Continued) • Use the picture on the previous page for the reference points mentioned in the questions below. Assume Ach Two O has a mass of 0.02 kg. • How much of Ach Two O’s energy at A is Kinetic Energy (EK )? • How much of Ach Two O’s energy at D is Kinetic Energy (EK )? • Draw a pie graph that shows how the Gravitational potential Energy (EGRAV ) shifts to Kinetic Energy as Ach Two O moves from A to D. • A B C D 10

12. Quick Research: Assessment • Search: • Research waterfalls to find a photo and height • Gather: • A photo • Right click photo, select ‘Add image to iPhoto Library’ • Find the and record the height of the waterfall • Analyze: mass = 1 kg of H20 • Find the EGRAV of 1 kg of H20 at the top of the falls • Use EGRAV= mghto solve for EGRAV • Find the velocity at the base of the falls • Use EK= ½ mv2 to solve for v. • Create: Go to http://padlet.com/wall/cv0n1gs23w • Use my example to see how to post yours! Bonus: Find the airfare from KC to the airport nearest your waterfall and start planning your trip to see it in person!! 11 Honors