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Objectives 531-541 Student power Point

Objectives 531-541 Student power Point. Mr. Smet’s Scientific Studies. How this works.

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Objectives 531-541 Student power Point

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  1. Objectives 531-541Student power Point Mr. Smet’s Scientific Studies

  2. How this works • This Power Point presentation has been made to walk you through the worksheet. It will answer a short number of the questions from your packet but also go through the key points of answering the other questions with examples. • The questions in this packet are very similar to the ones you will see on the test on Friday. This means that, by Friday, you should be able to answer the questions on your own without the help of this PowerPoint. • Work with urgency!

  3. Potential and Kinetic ENergy Kinetic Energy • Kinetic energy is the energy of motion. • Anything that is moving has kinetic energy. • Things that increase kinetic energy: • More mass • More speed Potential Energy • Potential energy is stored energy. • Anything that can become lower has potential energy. • Things that increase potential energy: More mass More height Examples on next slide.

  4. PE and KE Examples Potential Energy • An airplane is flying through the air. • This has potential energy • The airplane is above the ground. • A skateboard is rolling on the ground. • This does not have potential energy. • The skateboard is on the ground and cannot go any lower. • Kinetic Energy • An airplane is flying in through the air. • This haskinetic energy. •  The airplane is moving. • A skateboard is rolling on the ground. • This has kinetic energy. •  The skateboard is moving.

  5. When are potential and kinetic energies greatest? 11, 15 Which ball on the graph has the most potential energy? 12, 16 which ball on the graph has the least potential energy? 13, 17 Which ball on the graph has the most kinetic energy? 14, 18 Which ball on the graph has the least kinetic energy?

  6. The Law of Conservation of Energy • Energy cannot be lost or destroyed. • This means that potential energy does notdisappear when an object gets lower—instead, it is transformed into a different type of energy, like thermal, sound, light, or kinetic energy.

  7. The Law of Conservation of Energy • It also means that when potential or kinetic energy decreases, the other usually increases. • To see this, return to http://phet.colorado.edu/sims/energy-skate-park/energy-skate-park_en.jnlp • Click on Bar Graph, and watch how the potential and kinetic change together.

  8. Using the Law of conservation of Energy (questions 19-27) • Find the potential and kinetic energy an object has at any single point. • Add these two numbers together to find out its total energy. • To find out its potential energy at a point: • Subtract the object’s kinetic energy from the total energy. • If the object is not moving because it is as high as it can go, then all of its energy is potential energy. • To find out its kinetic energy at a point: • Subtract the object’s potential energy from the total energy. • If the object on the ground, all of its energy is kinetic energy.

  9. For example… • Steps 1 and 2 have you find the total energy of an object by finding it’s potential and kinetic energies at one position and adding them together. • If at position A, the ball has 20 joules of potential energy and 2 joules of kinetic energy, we can add these together to find the total energy. • TE = PE + KE • TE = 20J + 2J • TE = 22J

  10. For example…Take 2 • Let’s try that again for a different spot on the hill. Since we know that the total energy of an object doesn’t change, what do you think it’s total energy will be this time? • If at position D, the ball has 22 joules of kinetic energy and 0 joules of potential energy, we can add these together to find the total energy. • TE = PE + KE • TE = 0J + 22J • TE = 22J • Still the same!

  11. For example…Take 3 • Let’s try this again, but this time we’re talking about a different ball on the hill, so the total energy has changed. Figure out the total energy before going to the next slide. • If at position B, the ball has 4 joules of kinetic energy and 10 joules of potential energy, we can add these together to find the total energy.

  12. For example…Take 3 • Let’s try this again, but this time we’re talking about a different ball on the hill, so the total energy has changed. Figure out the total energy before going to the next slide. • If at position B, the ball has 4 joules of kinetic energy and 10 joules of potential energy, we can add these together to find the total energy. • TE = PE + KE • TE = 10J + 5J • TE = 15J

  13. For Example…. Part 2 • Steps 3 and 4 explain how to find the potential or kineticenergy of the ball at a point if you know it’s total energy and its kineticor potentialenergy at that point. • If you’ve already found its total energy, you only need to subtract its potential or kinetic energy from its total energy to find the other. • Ex: • PE = TE – KE • KE = TE – PE • There are examples on the next slide.

  14. For example… Part 2 • Let’s go back to the first example that we did. We found out that, at position A, the ball has a total energy of 22J. • At position B, the ball has 15J of potential energy. How much kinetic energy does it have? • To find the kinetic energy, we will subtract the potential energyfrom the total energy. • KE = TE – PE • KE = 22J – 7J • KE = 15J

  15. For example… Part 2 • Alright, one more example. The ball still has a total energy of 22J. • At position E, the ball has 18J of kinetic energy. How much potential energy does it have? • Find the answer out on your own beforegoing to the next slide.

  16. For example… Part 2 • Alright, one more example. The ball still has a total energy of 22J. • At position E, the ball has 18J of kinetic energy. How much potential energy does it have? • To find the potential energy, we will subtract the kinetic energy from the total energy. • PE = TE – KE • PE = 22J – 18J • PE = 4J

  17. Answer Questions • Go ahead and answer questions 19-27 in your packet.

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