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

LIVE INTERACTIVE LEARNING @ YOUR DESKTOP Engineering Design: Forces and Motion -- The Great Boomerang Challenge Presented by: Rudo Kashiri October 11, 2012 6:30 p.m. 8:00 p.m. Eastern time

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

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

Agenda NASA connection Lesson overview STEM connection Extensions NASA Explorer Schools

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

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

X 48 Experimental Aircraft

Let s Pause for Questions.

Flow Around an Airfoil

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?

How does velocity of A compare to B?

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?

Which surface has higher velocity?

Which surface has higher pressure?

Bernoulli's Principle

Let s Pause for Questions.

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

Lesson Support

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

Materials

Poll Question Boomerangs were once used as weapons. True False

Let s Pause for Questions.

5 E Lesson Design Engage Explore Explain Extend Evaluate

Engage Gain attention Prior knowledge Introduce the problem

Explore Design Build Test

Throwing the Boomerang

Score = Flight distance / Accuracy of return

Design Analyze Results Engineering Design Process Build Record Data Test

Let s Pause for Questions.

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

Tips How to hold How to throw How to catch

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

Explain Discuss aerodynamic forces Explain the designs

Poll Question Will a boomerang work in microgravity? Yes No

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

How is a boomerang like an airplane?

Evaluate Use Evaluation Rubric Design Packet to assess student learning

Let s Pause for Questions.

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?

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

Ideas

Let s Pause for Questions.

Lift Misconception Equal transit time: Incorrect airplane wing explanation

1. Push Direction button & change the angle to 4.5 2. 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?

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

Let s Pause for Questions.

Video Collection

NASA Now Classroom Videos

http://explorerschools.nasa.gov Rudo Kashiri rudo.g.kashiri@nasa.gov Thank you for joining us today.

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

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