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  1. ENERGY April 19, 2004 BY: BRIANNA SHIELDS

  2. DO NOW- Element, Compound, Mixture • 1. What type of matter is copper? • 2. What type of mixture is a cup of beans, rice and sunflower seeds? • 3. What type of mixture is a can of paint?


  4. Energy 1. The ability to do work 2. When work is done, energy is used What is energy?

  5. Mechanical 1. Energy associated with motion- movement of particles The five main types of energy

  6. Mechanical 2. Examples Airplane propeller Waterfall Wind Walking Hitting a ball Sound energy The five main types of energy

  7. Heat 1. The motion of particles and how fast they move 2. Faster movement = more heat The five main types of energy

  8. Heat 3. Examples Created when you rub hands together Causes ice to melt and water to boil The five main types of energy

  9. Chemical 1. Required to bond atoms together 2. When bonds break, energy is released The five main types of energy

  10. Chemical 3. Examples Start a fire to release it Shoot off a rocket Digesting food Using muscles to play sports The five main types of energy

  11. Electromagnetic 1. Created by moving electric charges 2. Associated with electricity and light The five main types of energy

  12. Electromagnetic 3. Examples Power lines Electric motors Light energy (colors of light) X-rays, radios, laser light The five main types of energy

  13. Nuclear 1. Created by splitting the nucleus of an atom 2. Powerful!! 3. Ex: Atomic bomb The five main types of energy

  14. Label the type of energy used: • a. Ice cream cone melting • b. Earthquakes

  15. Label the type of energy used: • c. Volcanoes • d. Lightning

  16. Label the type of energy used: • e. Lizard crawling • f. Someone shouting

  17. Label the type of energy used: • g. Digesting food • h. Dropping a bomb

  18. Label the type of energy used: • i. Rainbows • j. Playing a guitar (as well as sound coming out)

  19. Label the type of energy used: • k. Radio • l. Launching a space shuttle

  20. Energy Conversions 1. Changing one type of energy into another Energy Conversions

  21. Energy Conversions Examples A. Battery: Chemical --> Electromagnetic Energy Conversions: Battery

  22. Energy Conversions B. Electric Motor: Electromagnetic--> Mechanical Energy Conversions: Electric Motor

  23. Energy Conversions C. Car engine = chemical ---> heat---> mechanical (fuel burned--> heated up--> car moves/runs) Energy Conversions: Car Engine

  24. Energy Conversions D. Microphone = mechanical --> electromagnetic---> mechanical Sound --> electricity--> into loudspeaker---> creates sound Energy Conversions: Microphone

  25. Energy Conversions E. Flashlight = chemical (batteries) ---> electromagnetic (electricity)---> electromagnetic (light) Energy Conversions: Flashlight

  26. Energy Conversions F. Hair dryer = chemical (coal) ---> heat (steam)---> mechanical (turbine)--> electromagnetic (electric)--> heat and mechanical (dryer) Energy Conversions: Hair Dryer

  27. Describe the energy conversions • Water is boiled. The resulting steam is blown against huge turbine blades. The turning blades spin in a magnetic field, producing electricity. Describe in order, the energy conversions • ANSWER: heat energy--> mechanical energy--> electromagnetic energy

  28. Describe the energy conversions • Corn growing during the summer due to photosynthesis. • ANSWER: electromagnetic (light) energy--> chemical energy (photosynthesis)--> mechanical energy (growth)

  29. Describe the energy conversions • Battery lighting a light bulb • ANSWER: chemical--> electromagnetic

  30. Electro-magnetic Mechanical Types of Energy Nuclear Chemical Heat

  31. Kinetic Types of Energy Potential

  32. Kinetic Energy 1. The energy of motion or movement 2. The faster something is, the more KE it has Kinetic Energy

  33. Kinetic Energy Examples: A. Soaring tennis ball Kinetic Energy

  34. Kinetic Energy Examples: B. Car driving Kinetic Energy

  35. Kinetic Energy Examples: Flung rubberband Thrown Baseball Kinetic Energy

  36. Kinetic Energy Examples: E. Falling Object Kinetic Energy

  37. KINETIC ENERGY: Examples • Which has more KE………… • A fast ball or a curve ball in baseball? • An airplane flying or a car driving? • A running rabbit or a walking turtle? • HOW DO YOU KNOW THIS?

  38. Kinetic Energy Formula KE = 1/2 mv^2 KE = kinetic energy M= mass (kg) V= velocity Kinetic Energy

  39. KINETIC ENERGY: Example • Which has more kinetic energy? A 1 kg fast ball going 100m/s or a 1kg curve ball going 50 m/s? Show your calculations

  40. KINETIC ENERGY: Example • Which has more kinetic energy? A 10kg turtle going 5 m/s or a 2 kg rabbit going 25 m/s? • How could you make the rabbit have more kinetic energy than the turtle?

  41. Potential Energy 1. Energy of position = stored energy 2. The higher an object is in position, the more PE it has

  42. Potential Energy 3. Examples A. Compressed spring

  43. Potential Energy B. Stretched rubberband

  44. Potential Energy C. An archer’s bow pulled back

  45. Potential Energy D. House sitting on a hill

  46. Potential Energy E. Golf club wound back

  47. Potential Energy F. Trampoline pushed down

  48. Potential Energy Formula: PE = mgh PE= potential energy M= mass (kg) G= 9.8 m/s^2 H= height (m)

  49. POTENTIAL ENERGY: Examples • Which has more potential energy- a 10kg box on a 12 meter tall shelf, or a 10kg box on a 5 meter shelf. Show your calculations for this. • How could you increase the potential energy of the box on the 5 meter tall shelf?

  50. ASSESSMENT • Stacked wood logs