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Warm-up 3/24/11

Review: List as many flash card words as you can think of (or if you have to see). Teach the Teacher: If you could drive any car what car would you want to drive? Learning Targets: Things that are in Ch. 4 List examples of different

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Warm-up 3/24/11

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  1. Review: List as many flash card words as you can think of (or if you have to see). Teach the Teacher: If you could drive any car what car would you want to drive? Learning Targets: Things that are in Ch. 4 List examples of different forms of energy Warm-up 3/24/11

  2. Review: What is a type of energy (think sun, electrons, and use your notes) Teach the Teacher: Would you rather eat toe jam or lice? Learning Targets: PE and KE Warm-Up 3/28/11

  3. Find a safe driving tip for each of the following, (GIVE PAGE NUMBERS!) Acceleration Speed Newton’s First Law Changing Velocity (in regards to turns) Driver’s ManualHangout

  4. Nothing happens without: Energy

  5. Energy • The ability to cause change • The ability to do WORK – Chapter 5 & 6 • Energy has many forms • Electrical • Chemical • Thermal • Radiant - Light • Nuclear • Sound • Magnetic • Kinetic • Potential • Mechanical Money analogy p 101

  6. Forms of Energy • There are many forms of energy. • Electrical • energy due to the movement of electrons • Chemical • energy stored in the bonds between atoms • Thermal • energy from heat • Radiant - Light • energy from the sun & light • Nuclear • potential energy stored in the nuclei of atoms • Sound • the energy of vibrating sound waves • Magnetic • energy of magnetism • Mechanical • Sum of PE & KE

  7. Kinetic Energy • Kinetic Energy—energy in the form of motion. • Examples—a spinning bicycle wheel, kicking a ball. • The amount of kinetic energy (KE) depends on 2 quantities: • The mass of the moving object and its velocity. • The more mass, the more kinetic energy. • Example: a truck and a motorcycle are both moving at 100 km/hr. Which one has more KE? • Answer: the truck, because it has more mass.

  8. Calculating Kinetic Energy • KE is energy of motion. • KE = ½ mv2 • m = mass (kg) • v = velocity (m/s) • SI Unit for Energy is Joule • Joule = kg m2/s2

  9. PEis energy that is storedin an object. Three types of PE 1. Elastic PE (ePE) Energy due to a stretch or compression 2. Chemical PE (CPE) Energy in the bonds between atoms 3. Gravitational PE (GPE) Energy due to an elevated position GPE = mgh m = mass g = gravity 10m/s2 h = height Potential Energy

  10. Flash Card • On the Front write: • Kinetic Energy • On the Back write: • Energy in the form of motion • KE = ½ mv2

  11. Flash Card • On the Front write: • Potential energy • On the Back write: • Energy that is stored • Elastic • Chemical • Gravitational

  12. Flash Card • On the Front write: • Gravitational PE (GPE) • On the Back write: • Energy due to an elevated position • GPE = mgh

  13. Penny Pusher See how much elastic PE is stored up when a rubber band is pulled back to different lengths. On 3x5 card: 1. Give the mass of the penny. 2. Pull back the rubber band 1 cm and release. How far did it go? 3. Pull back the rubber band 3 cm and release. How far did it go? 4. How far do you have to pull back to get the penny to go off the table? Physics TO Win It Challenge!

  14. Review: Make sure you have and know these two flash card words: Kinetic Energy and Potential Energy Teach the Teacher: What do you think of block classes? Learning Targets: PE and KE energy Warm up 3/30/11

  15. Kinetic or Potential

  16. Kinetic or Potential

  17. Kinetic or Potential?

  18. Kinetic or Potential

  19. Kinetic or Potential?

  20. Kinetic or PoTential

  21. Kinetic or Potential

  22. Kinetic or Potential

  23. Kinetic or Potential

  24. 1. Find where it talks about Potential energy. What are the three kinds of potential energy? 2. What is elastic potential energy? 3. What are the two things kinetic energy depends on? 4. Finish this sentence: The more mass an object has the more _____________. Notes to a Notecard

  25. Nuclear Energy • There are two types of nuclear energy • Fission and Fusion • For both forms energy is stored as mass in the atoms of certain elements. This mass can be changed into energy under the proper conditions according to Albert Einstein's famous equation: • nuclear fission • nuclear fusion

  26. Fusion & Fission • Fusion atoms are "fused" together • In fusion lighter elements form heavier elements • Uses • The middle of stars • Fission the 2nd form of nuclear energy • The exact opposite of fusion. • In fission atoms are broken apart. • In fission heavier elements form lighter elements. • Uses • Hydrogen Bomb • Nuclear Energy Plants

  27. Law of Conservation of Energy • Energy can not be created nor destroyed, it just changes form. • Mechanical Energy = KE + PE • Rollercoaster • mass and spring

  28. Law of Conservation of Energy Continued • Your body follows the law of conservation of energy. • Ex. Chemical potential energy is stored in the food you eat. • Ex. Your body stores energy in fat and other chemicals. • Ex. Your body converts the energy to make you move.

  29. Swinging • On a swing or a pendulum the mechanical energy is also constant. • To get moving, you need KE. As you rise higher, your GPE increases. As you move down, your KE increases. Mechanical Energy is constant.

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