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October 11, 20126:30 p.m. – 8:00 p.m. Eastern time

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

Presented by: Rudo Kashiri

Rudo KashiriNASA Explorer Schools Education SpecialistNASA Langley Research CenterHampton, VA

Introducing today’s presenter…

Engineering Design/ Forces and Motion

The Boomerang Challenge

Rudo KashiriNES Education Specialist

NASA Langley Research Center

AgendaNASA connection

Lesson overview

STEM connection

Extensions 

NASA Explorer Schools

Introduction

Grade Level: 9 ‐ 12

Subject Areas: Science and Engineering

National Education StandardsPhysical Science: Force and motionScience 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 forQuestions.

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 forQuestions.

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

Boomerangs were once used as weapons.

Poll Question

✔ True

✖ False

Let’s Pause forQuestions.

Engage

Explore

Explain

Extend

Evaluate

5‐E Lesson Design

Engage

Gain attention

Prior knowledge 

Introduce the problem

Explore

Design

Build

Test 

Throwing the Boomerang

Score = Flight distance / Accuracy of return

DesignDesign

BuildBuild

TestTestRecordDataRecordData

AnalyzeResultsAnalyzeResults Engineering 

Design ProcessEngineering 

Design Process

Let’s Pause forQuestions.

Design Factors

Mass

Number of blades

Blade length

Blade thickness

Angle of attack

Tips

How to hold

How to throwHow 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

Will a boomerang work in microgravity?

✔ Yes

✖ No

Poll Question

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 forQuestions.

Which of the following can be used to describe the flight of a boomerang?

Aerodynamic lift

Newton’s 2ndlaw of motion

CentripetalforceGyroscopic precession 

Moment of inertia

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 forQuestions.

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 forQuestions.

Video Collection

NASA Now Classroom Videos

http://explorerschools.nasa.govRudo Kashiri

rudo.g.kashiri@nasa.govThank you for joining us today.

Rudo KashiriNASA Explorer Schools Education SpecialistNASA Langley Research CenterHampton, VA

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