Critical Load

jun 19 2014

Source: IEEE

Overblik

Nøgleord

civil engineering, design, motion, forces, buildings, structures, critical load

Emne:

Teknologi

Fysik

Kompetencer:

Opgave løsning

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Diskussion

Gruppearbejde

Tidsforbrug (kan skaleres)

1-2 timer

Målgruppe (Amerikansk standart)

4. klasse (10-11år)

5. klasse (11-12 år)

6. klasse (12-13år)

7. Klasse (13-14 år)

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LESSON

Danske målgrupper og forudsætninger

Danske målgruppe

Through this lesson, students will:

Learn about civil engineering and the testing of building structure.
Learn about efficiency ratings and critical load.
Learn about teamwork and the engineering problem solving.

Mål

As a result of this activity, students should develop an understanding of:

efficiency ratings and critical load
structural design and testing
engineering problem solving
measurement and reporting
teamwork

Forløbsmaterialer

Baggrund

The efficiency rating measures the weight that will cause a structure to fail divided by the weight of the structure itself. The most efficient structures are strong and lightweight - a difficult combination to achieve. For example, roofers in areas which experience heavy snows must factor in the weight of a massive snowstorm into designing the strength of the roof. The weight at which a building or structure fails is called the "critical load."

Materialer:

One set of materials for each student team:
- twelve unused playing cards
- one roll of scotch tape
- 4 coins
Testing materials:
- Base of empty square based two quart cardboard
- juice/milk container
- Objects to build weight of base from 4 - 10
- pounds (coins, marbles, sand)
Student handout

Fremgangsmåde:

Provide each student team with materials and ask them to devise a structure that will hold the most weight. They are to plan out their structure, and build a prototype for testing. Allow 10 minutes for planning and execution.
Instructor places weights on each team's prototype increasing the weight until the structure fails. Students chart the maximum load each prototype successfully held (the amount just prior to failure)
Each student group presents their vision for their design, and explains why they think their design did well or failed. Ask students how would they adjust the design if they could do it again?

Differentiering

Write an essay or a paragraph describing a recognizable building in your town. Include the history, interesting challenges to the building's engineering, and challenges that the engineers faced in design and construction.

Målstyring og evaluering

If you are interested in learning how to make your own rubric for this or other lessons, you may be interested in watching the How to Make a Rubric video below.

These reflective questions will help assess student understanding:

What was one thing you liked about your design? What is its main weakness?
What is one thing you would change about your design based on your experience?
Are there algebraic and physical principles that can be applied to this activity?
How would you modify the instructions to create a better experience for the participants?

Supplerende materiale

TryEngineering
Bryan Burg Cardstacker
Great Structures of the World
ITEA Standards for Technological Literacy: Content for the Study of Technology
National Science Education Standards

Credits

This lesson was originally created for TryEngineering by IEEE.

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