engineering design: forces and motion -- the great ......oct 11, 2012 · the great boomerang...
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LIVE INTERACTIVE LEARNING @ YOUR DESKTOP
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
[email protected] you for joining us today.
Rudo KashiriNASA Explorer Schools Education SpecialistNASA Langley Research CenterHampton, VA
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