Engineering Design: Forces and Motion -- The Great Boomerang Challenge

Transcription

1 LIVE INTERACTIVE YOUR DESKTOP Engineering Design: Forces and Motion -- The Great Boomerang Challenge Presented by: Rudo Kashiri October 11, :30 p.m. 8:00 p.m. Eastern time

2 Introducing today s presenter Rudo Kashiri NASA Explorer Schools Education Specialist NASA Langley Research Center Hampton, VA

3 Engineering Design/ Forces and Motion The Boomerang Challenge Rudo Kashiri NES Education Specialist NASA Langley Research Center

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5 Agenda NASA connection Lesson overview STEM connection Extensions NASA Explorer Schools

6 Introduction Grade Level: 9 12 Subject Areas: Science and Engineering National Education Standards Physical Science: Force and motion Science and Technology Abilities of technological design Understanding about science and technology

7 NASA Connection Aerodynamics research Engineering studies Computer simulation technology NASA low speed airfoil research

8 X 48 Experimental Aircraft

9 Let s Pause for Questions.

10 Flow Around an Airfoil

11 Set airfoil angle at 0.0 degrees Push Velocity, Animation, & Close View buttons Move the probe to A What is the velocity? Move the probe to B What is the velocity?

12 How does velocity of A compare to B?

13 Change angle to 4.5 degrees. What is the value of lift? What is the velocity on the upper and lower surface of the foil? Which surface has higher velocity? Push the Pressure button. Which surface has higher pressure? How does this relate to the velocity?

14 Which surface has higher velocity?

15 Which surface has higher pressure?

16 Bernoulli's Principle

17 Let s Pause for Questions.

18 The Great Boomerang Challenge Use the engineering design process to complete a team challenge Show how aerodynamic forces influence the flight characteristics of designs including Bernoulli s Principle

19 Lesson Support

20 Lesson in Detail Design and construct a returning boomerang that will allow for the greatest flight distance relative to the accuracy of boomerang return.

21 Materials

22 Poll Question Boomerangs were once used as weapons. True False

23 Let s Pause for Questions.

24 5 E Lesson Design Engage Explore Explain Extend Evaluate

25 Engage Gain attention Prior knowledge Introduce the problem

26 Explore Design Build Test

27 Throwing the Boomerang

28 Score = Flight distance / Accuracy of return

29 Design Analyze Results Engineering Design Process Build Record Data Test

30 Let s Pause for Questions.

31 Design Factors Mass Number of blades Blade length Blade thickness Angle of attack

32 Tips How to hold How to throw How to catch

33 General Tuning Bending your boomerang Twisting the arms of your boomerang Modifying the weight of your boomerang

34 Explain Discuss aerodynamic forces Explain the designs

35 Poll Question Will a boomerang work in microgravity? Yes No

36 Extend Discuss principles of boomerang flight on Earth vs. aboard ISS

37 How is a boomerang like an airplane?

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39 Evaluate Use Evaluation Rubric Design Packet to assess student learning

40 Let s Pause for Questions.

41 Aerodynamic lift Newton s 2 nd law of motion Centripetal force Gyroscopic precession Moment of inertia Which of the following can be used to describe the flight of a boomerang?

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43 Boomerang Math What happens to L (angular momentum) when I (moment of inertia) increases and ω (angular velocity ) is constant? L = I ω

44 Ideas

45 Let s Pause for Questions.

46 Lift Misconception Equal transit time: Incorrect airplane wing explanation

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48 1. Push Direction button & change the angle to Move the yellow particle at both A and B to the rear of the airfoil 3. Do the particles line up far downstream from the airfoil?

49 Do the particles line up far downstream from the airfoil? Incorrect airplane wing explanation

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51 Let s Pause for Questions.

52 Video Collection

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55 NASA Now Classroom Videos

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57 Rudo Kashiri Thank you for joining us today.

58 Thanks to today s presenter Rudo Kashiri NASA Explorer Schools Education Specialist NASA Langley Research Center Hampton, VA

59 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.

60 National Science Teachers Association Gerry Wheeler, Interim Executive Director Zipporah Miller, Associate Executive Director, Conferences and Programs Al Byers, Ph.D., Assistant Executive Director, e-learning and Government Partnerships Flavio Mendez, Senior Director, NSTA Learning Center NSTA Web Seminars Brynn Slate, Manager Jeff Layman, Technical Coordinator