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The Wonderful World of…

The Wonderful World of… . TECHNOLOGY. IN YOUR OPINION:. What IS technology?. What is Technology?.

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The Wonderful World of…

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  1. The Wonderful World of… TECHNOLOGY

  2. IN YOUR OPINION: What IS technology?

  3. What is Technology? Technology is the making, usage, and knowledge of tools, machines, techniques, crafts, systems or methods of organization in order to solve a problem or perform a specific function. (Wikipedia definition)

  4. What’s a Technical Object? A man-made object that serves a purpose.

  5. Your Pencils • Is it a technical object? • Take a look at your pencils in your hands. • What are the materials it is made of? • How are materials decided for certain technical objects?

  6. MATERIALS • External forces produce various effects inside a material. EXAMPLE: *Consider what would happen if an elephant walked in the room and stepped on your pencil. What would the effect be? EXTERNAL FORCE = Elephant weight EFFECT = pencil being crushed

  7. Different materials react differently to different external forces. A material will undergo a mechanical constraint due to the force.

  8. MECHANICAL CONSTRAINTS “A mechanical constraint describes the stress produced within a material when it is subjected to external forces.” 5 types of constraints: Compression, Tension, Torsion, Bending, Shearing

  9. COMPRESSION: Force that crushes materials

  10. TENSION: Force that stretches materials

  11. TORSION:Force that twists materials

  12. BENDING:Force that bends materials

  13. SHEARING:Force that cuts or tears materials

  14. EXAMPLES: Tension, bending • SHOES: • CLICKER: • WATER BOTTLE: Compression Torsion, bending, compression

  15. What happens when there is TOO MUCH STRESS (constraint) on material? • Elastic deformation – Temporary deformation of material. Resumes shape. • Plastic deformation – Remains deformed. • Fracture – Material ruptures.

  16. Your Pencils (again) Have you ever asked yourself why pencils are never made out of rubber? Or out of glass?

  17. MECHANICAL PROPERTIES • Determines how a material will react when it is subjected to one (or more) mechanical constraints. • Examples of properties: Hardness, elasticity, ductility, malleability, tensile strength

  18. HARDNESS Resists penetration Reacts to pressure force by elastic deformation

  19. ELASTICITY Regains initial shape Reacts to force by elastic deformation

  20. RESILIENCE Resists physical impacts Reacts to temporary force by elastic deformation.

  21. Building Design Pulls Structure Upright after Earthquake http://www.youtube.com/watch?v=j87UWgvetRg

  22. Rumplestiltskin

  23. DUCTILITY Stretches without breaking Reacts to tension force by plastic deformation.

  24. MALLEABILITY Flattens or bends without breaking Reacts to bending or compression force by plastic deformation.

  25. TENSILE STRENGTH Resists tension without becoming permanently deformed Reacts to tension force by elastic deformation

  26. SUMMARY: Properties

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