1. LIVE INTERACTIVE LEARNING @ YOUR DESKTOP October 24, 2011 Center of Mass and Center of Pressure: Engineering a Stable Rocket Presented by: Rachel Power

2. NASA Explorer Schools Presents

3. Outline for Web Seminar  Navigating the Guide  Navigating the Activity  Building a Launcher  Building a Rocket  STEM Concepts  Additional Resources

5. explorerschools.nasa.gov

9. Table of Contents  A Pictorial History of Rocketspg 1  How Rockets Workpg 19  Applying Newton’s Lawspg 24  National Standards Matrixpg 31  Suggested Grade Levelspg 33  Additional Explorations pg 140

10. Which civilization is credited with the first recorded use of rocket propulsion? A. Chinese B. Russian C. Greek D. German

11. A Pictorial History

12. How Rockets Work

13. Applying Newton ’ s Laws

14. National Standards Matrix

15. Suggested Grade Levels

16. Let’s Pause for Questions Please type your questions in the chat!

18. Teacher Pages

22. Student Pages

23. Calculating Area

24. Let’s Pause for Questions Please type your questions in the chat!

26. High-Power Launcher  Low cost  Parts in plumbing or hardware stores  Easy to assemble and use  Bicycle pump or air compresso r

27. Shopping and Assembly

28. Pop! Rocket Launcher  Minimal cost  Even easier to assemble and use  Parts at plumbing or hardware stores

29. Shopping and Assembly

30. Which type of launcher do you plan to use? A. High-power launcher B. Pop! rocket launcher C. Undecided

31. Safety Plan and Tips

32. Let’s Pause for Questions Please type your questions in the chat!

34. Making Basic High-Power Paper Rockets

35. EngineeringDesignProcess

36. Materials

37. Assembly

38. Let’s Pause for Questions Please type your questions in the chat!

40. Sounding Rockets

41. Forces on a Rocket weight thrust drag lift

42. Rocket Stability center of pressure center of gravity

43. x For simple shapes:  Balance rocket using a string or an edge such as your finger or meter stick For simple shapes:  Balance rocket using a string or an edge such as your finger or meter stick Finding Center of Gravity

44. For more complex shapes:  Hang the rocket from some point  Drop weighted string from point  Draw line on rocket along string  Repeat from another point  Find the point of intersection For more complex shapes:  Hang the rocket from some point  Drop weighted string from point  Draw line on rocket along string  Repeat from another point  Find the point of intersection x Finding Center of Gravity

45. x  Trace the shape of rocket on cardboard  Cut out the shape  Determine the balance point  Trace the shape of rocket on cardboard  Cut out the shape  Determine the balance point Finding Center of Pressure

46. c g W = w n d n + w b d b + w f d f W = w n + w b + w f W = w n + w b + w f c g W = w n d n + w b d b + w f d f W = w n + w b + w f W = w n + w b + w f Mathematical Approximation Center of Gravity

47. c g = w n d n + w b d b + w f d f c g = w n d n + w b d b + w f d fW W Mathematical Approximation Center of Gravity

48. Mathematical Approximation Center of Pressure c p A = a n d n + a b d b + a f d f A = a n + a b + a f A = a n + a b + a f c p A = a n d n + a b d b + a f d f A = a n + a b + a f A = a n + a b + a f

49. c p = a n d n + a b d b + a f d f c p = a n d n + a b d b + a f d fA A Mathematical Approximation Center of Pressure

50. Let’s Pause for Questions Please type your questions in the chat!

52. Rocket Wind Tunnel

53. Launch Altitude Tracker

54. Additional Explorations Calculating Altitude

55. Advanced High-Power Paper Rockets

56. Collaboration

57. Feedback

58. Let’s Pause for Questions Please type your questions in the chat!

59. http://explorerschools.nasa.gov

60. Thank you to the sponsor of tonight's Web Seminar: This web seminar contains information about programs, products, and services offered by third parties, as well as links to third-party websites. The presence of a listing or such information does not constitute an endorsement by NSTA of a particular company or organization, or its programs, products, or services.

61. http://learningcenter.nsta.org

62. National Science Teachers Association Dr. Francis Q. Eberle, Executive Director Zipporah Miller, Associate Executive Director Conferences and Programs Al Byers, Assistant Executive Director e-Learning LIVE INTERACTIVE LEARNING @ YOUR DESKTOP NSTA Web Seminars Paul Tingler, Director Jeff Layman, Technical Coordinator