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Tuesday May 21

Tuesday May 21. Overview Energy. Motion Object Potential Mechanical Energy Chemical Elastic Chemical Gravitational Elastic Gravitational. The nature of energy. Energy of a spinning bicycle wheel Energy stored in food Energy stored in a boulder on a ….

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Tuesday May 21

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  1. Tuesday May 21

  2. Overview Energy • Motion • Object • Potential • Mechanical Energy • Chemical • Elastic • Chemical • Gravitational • Elastic • Gravitational

  3. The nature of energy • Energy of a spinning bicycle wheel • Energy stored in food • Energy stored in a boulder on a …. • Energy stored in a stretched string • Energy that is stored • Less • More • Energy • Joule • Potential,kinetic • Potential • Chemical

  4. Chapter Test Continued • A • D • B • C • A • B • D • C Understanding Concepts • A. PE=mgh=10(9.8)(1.5)=147 J B. PE=mgh=(10)(9.8)(1)= 9.8 J 2. KE= ½ mv2= .5(10)(10)(10)= 500 J 3. KE=PE=147 J

  5. There are two types of potential energy problems. A 4.5 kg dictionary sits on a 4.0 m high shelf. Find its potential energy. A 12-N copper ball sits on a church stepple 40 m above the ground. Find its potential energy. PE=WH PE= 12(40) PE=480 J • PE= mgh • PE= 4.5 (9.8) 4 • PE= 176.4 J

  6. An automobile to be transported by ship is raised 7.0 m above the dock. If its gravitational potential energy is 66000 J, find its mass. • Given • Solution

  7. An automobile to be transported by ship is raised 7.0 m above the dock. If its gravitational potential energy is 66000 J, find its mass. • Given H= 7.0 m A= 9.8 m/s/s PE= 66 000 J M= ? • Solution • PE=mgh • M=PE/gh • M= 66 000/9.8(7) • M= 960 kg

  8. The world record for pole vaulting is 6.15 m. If the athlete’s gravitational potential energy is 4,942 J, what is his mass? • Given • Solution

  9. The world record for pole vaulting is 6.15 m. If the athlete’s gravitational potential energy is 4,942 J, what is his mass? • Given • H= 6.15 m • PE= 4942 J • G= 9.8 m/s/s • M=? • Solution • PE=mgh • M=PE/gh • M= 4942/9.8(6.15) • M= 82 kg

  10. Find the kinetic energy of a .045 kg hockey puck traveling at 45 m/s. • KE= ½ mv2 • KE= ½ (.045) (45)(45) • KE= 45.56 J

  11. A baseball is pitched with a speed of 35 m/s. Calculate its kinetic energy if it has a mass of 0.146 kg? • Given • Solution

  12. A baseball is pitched with a speed of 35 m/s. Calculate its kinetic energy if it has a mass of 0.146 kg? • Given • M= 0.146 kg • V= 35 m/s • KE= ? • Solution • KE= ½ mv2 • KE= (.5)(0.146)(35)(35) • KE= 89 J

  13. A “ping-pong” ball has a mass of .00245 Kg and can be given a speed of 4.0 m/s. Find its kinetic energy? • Given • Solution

  14. A “ping-pong” ball has a mass of .00245 Kg and can be given a speed of 4.0 m/s. Find its kinetic energy? • Given • M= 0.00245kg • V= 4 m/s • KE= ? • Solution • KE= ½ mv2 • KE= (.5)(0.00245)(4)(4) • KE= 0.0196 J

  15. Potential Energy Worksheet • 1. PE=mgh or PE=WH • 2. Joule (J) 3. PE=WH PE=12(21) PE=252 J

  16. Potential Energy Worksheet 4. PE=WH PE=79(20) PE= 1580 J • PE=WH PE=190(45) PE=8550 J

  17. Potential Energy Worksheet • PE=WH PE= 966(72) PE= 69, 552 J • PE=mgh PE=5(9.8)12) PE= 588 J

  18. Kinetic and Potential Energy Worksheet 1 KE= ½ mv2 • KE= ½ 2.1(30*30) • KE= 945 J 2 KE= ½ mv2 • KE= ½ (1120) 40 * 40 • KE= 8,960,000 J

  19. Kinetic and Potential Energy Worksheet • D • A • D • Friction.

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