GK12 Review Presentation
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Transcript of GK12 Review Presentation
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GK12 Review PresentationGK12 Review Presentation
C.J. DeGroot
St. Louis Charter School
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Three Units• Designing and Building File-Folder Bridges
– Build a Model Truss Bridge– Test the Strength of Structural Members– Analyze and Evaluate a Truss
• Hazard Mitigation Letter• Tsunami Brochure
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Designing and Building File-Folder Bridges• Brief introduction to engineering
– What is engineering?– What do engineers do?– What type of people are engineers?– What different types of engineering exist?– What things do engineers work on?– Types of Engineering
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Designing and Building File-Folder Bridges• Learning Objectives: Build a Model Truss Bridge
– Identify different types of bridges– Explain what a truss is– Identify the major components of a truss bridge– Identify types of truss bridges– Explain fundamental engineering concepts:
• Force, Load, Reaction, Equilibrium, Tension, Compression, Strength
– Explain how a truss carries load– Explain the roles of owner, design professional,
constructor, project manager– Explain how construction quality affects structural
performance
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TeachEngineering.org Activity• Tension or Compression?
– Write down if the items indicated in the following pictures are in tension or compression
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Tension or Compression?1. Chain of a swing
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Tension or Compression?2. Leg of a swing set
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Tension or Compression?3. Leg of a desk
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Tension or Compression?4. Bike Chain
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Tension or Compression?5. Spoke
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Tension or Compression?6. Arm
http://www.healthstylesexercise.com/catalog/images/Perfect-Pushup.jpg
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Tension or Compression?7. Arm
http://z.about.com/d/weighttraining/1/0/Z/0/-/-/pullup1.jpg
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Tension or Compression?8. Tennis Ball
http://people.rit.edu/andpph/photofile-c/tennis-ball-rebound-2a.jpg
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Tension or Compression?9. Racket Strings
http://people.rit.edu/andpph/photofile-c/tennis-ball-rebound-2a.jpg
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Tension or Compression?10. Shoelace
http://www.acasports.co.uk/images/products/full/adidas_adipure_sg.jpg
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Tension or Compression?11. Clothes in a full suitcase
http://farm2.static.flickr.com/1399/989922244_9c0ed3bf6e.jpg?v=0
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Tension or Compression?12. Kite string
http://rick.files.wordpress.com/2008/06/kite_fight.jpg
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Tension or Compression?13. Power lines
http://www.liquidmatrix.org/blog/wp-content/uploads/2007/08/powerline.JPG
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Tension or Compression?14. Tripod legs
http://www.liquidmatrix.org/blog/wp-content/uploads/2007/08/powerline.JPG
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Tension or Compression?15. Spring
http://www.ux1.eiu.edu/~cfadd/1350/08PotEng/Images/8.2.gif
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Tension or Compression?16. Truss member DK
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Designing and Building File-Folder Bridges• Learning Objectives: Test the Strength of
Structural Members– Calculate cross-sectional area of a member– Describe yielding, rupture, and buckling failure – Explain the factors that affect the tensile strength and
compressive strength of a member– Design a testing program to determine the strength of
structural members– Explain the principle of the lever and apply it– Determine the tensile strength and compressive
strength of structural members experimentally– Use a computer to analyze and graph data
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• Principle of the Lever – Forces must be balanced– Moment must be balanced around the fulcrum
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• Tensile Strength Graph
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• Compressive Strength Graph
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Designing and Building File-Folder Bridges• Learning Objectives: Analyze and Evaluate a
Truss– Calculate the components of a force vector– Add force vectors– Explain fundamental engineering concepts:
• Free body diagram, equilibrium, structural model, symmetry, static determinacy, stability, factor of safety
– Use the Method of Joints to calculate the internal force in truss members
– Determine the strength of every member– Evaluate a truss to determine if it can safely carry a
given load
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• Add Force Vectors
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• Add Force Vectors
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• Add Force Vectors
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• Method of Joints
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Hazard Mitigation Letter• Learned about structural and nonstructural
earthquake mitigation (focused on nonstructural)• Learned Mitigation Techniques for:
- Computer EquipmentComputer Equipment - Gas shut-off valves- Gas shut-off valves- Hot water heatersHot water heaters - Windows- Windows- Pictures and MirrorsPictures and Mirrors - Flexible gas lines- Flexible gas lines- Bookcases/cabinetsBookcases/cabinets - Chimneys/Masonry- Chimneys/Masonry- Light FixturesLight Fixtures - Securing heavy - Securing heavy
objectsobjects- Library stacksLibrary stacks - Signs/Bulletin - Signs/Bulletin
boardsboards- Securing heavy equipmentSecuring heavy equipment
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Hazard Mitigation Letter• Learned what to do before, during, and after an
earthquake• Broke into two groups for “inspecting” the school• Each student was responsible to write a
persuasive letter about how the school could be made safer through earthquake mitigation techniques
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Tsunami Brochure• For the globalization requirement, we studied the
2004 Indian Ocean Tsunami• Students chose a particular country to focus on• Students were responsible for their own research
– Amy and I provided guidance (no Wikipedia, etc.)
• Students each made a three-panel informational brochure with Microsoft Publisher– Information about tsunamis– Information about their country– Information about rebuilding in their country
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