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LIVE INTERACTIVE LEARNING @ YOUR DESKTOP
October 24, 2011
Center of Mass and Center of Pressure: Engineering a Stable Rocket
Presented by: Rachel Power
NASA Explorer Schools PresentsNASA Explorer Schools PresentsNASA Explorer Schools PresentsNASA Explorer Schools Presents
Outline for Web SeminarOutline for Web SeminarOutline for Web SeminarOutline for Web Seminar
Navigating the GuideNavigating the Guide Navigating the ActivityNavigating the Activity Building a LauncherBuilding a Launcher Building a RocketBuilding a Rocket STEM ConceptsSTEM Concepts Additional ResourcesAdditional Resources
Table of ContentsTable of ContentsTable of ContentsTable of Contents A Pictorial History of RocketsA Pictorial History of Rockets pg 1pg 1 How Rockets WorkHow Rockets Work pg 19pg 19 Applying Newton’s LawsApplying Newton’s Laws pg 24pg 24 National Standards MatrixNational Standards Matrix pg 31pg 31 Suggested Grade LevelsSuggested Grade Levels pg 33pg 33 Additional Explorations Additional Explorations pg 140pg 140
Which civilization is credited Which civilization is credited with the first recorded use of with the first recorded use of
rocket propulsion?rocket propulsion?
Which civilization is credited Which civilization is credited with the first recorded use of with the first recorded use of
rocket propulsion?rocket propulsion?
A. Chinese
B. Russian
C. Greek
D. German
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Hig
h-Po
wer La
un
cher
Hig
h-Po
wer La
un
cher
Low costLow cost Parts in plumbing or Parts in plumbing or
hardware storeshardware stores Easy to assemble and useEasy to assemble and use Bicycle pump or air Bicycle pump or air
compressocompressorr
Pop
! Rocke
t Lau
nch
er
Pop
! Rocke
t Lau
nch
er
Minimal costMinimal cost Even easier to assemble Even easier to assemble
and useand use Parts at plumbing or Parts at plumbing or
hardware storeshardware stores
Which type of launcher do Which type of launcher do you plan to use?you plan to use?
Which type of launcher do Which type of launcher do you plan to use?you plan to use?
A. High-power launcher
B. Pop! rocket launcher
C. Undecided
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x
For simple shapes:For simple shapes: Balance rocket using a Balance rocket using a
string or an edge such as string or an edge such as your finger or meter stickyour finger or meter stick
For simple shapes:For simple shapes: Balance rocket using a Balance rocket using a
string or an edge such as string or an edge such as your finger or meter stickyour finger or meter stick
Finding Center of GravityFinding Center of Gravity
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 GravityFinding Center of Gravity
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 PressureFinding Center of Pressure
ccggW = wW = wnnddnn + w + wbbddbb + w + wffddff
W = wW = wnn + w + wbb + w + wff
ccggW = wW = wnnddnn + w + wbbddbb + w + wffddff
W = wW = wnn + w + wbb + w + wff
Mathematical ApproximationMathematical ApproximationCenter of GravityCenter of Gravity
ccgg = w = wnnddnn + w + wbbddbb + w + wffddff
WW
ccgg = w = wnnddnn + w + wbbddbb + w + wffddff
WW
Mathematical ApproximationMathematical ApproximationCenter of GravityCenter of Gravity
Mathematical ApproximationMathematical ApproximationCenter of PressureCenter of Pressure
ccppA = aA = annddnn + a + abbddbb + a + affddff
A = aA = ann + a + abb + a + aff
ccppA = aA = annddnn + a + abbddbb + a + affddff
A = aA = ann + a + abb + a + aff
ccpp = a = annddnn + a + abbddbb + a + affddff
AA
ccpp = a = annddnn + a + abbddbb + a + affddff
AA
Mathematical ApproximationMathematical ApproximationCenter of PressureCenter of Pressure
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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.
National Science Teachers AssociationDr. 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 SeminarsPaul Tingler, Director
Jeff Layman, Technical Coordinator
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