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Technology Work book / Text book. Term # 3 Materials – Constraints Lab Mechanical Function – Links Lab Complex Mechanical Function – Gears Lab Noise Maker.

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Presentation on theme: "Technology Work book / Text book. Term # 3 Materials – Constraints Lab Mechanical Function – Links Lab Complex Mechanical Function – Gears Lab Noise Maker."— Presentation transcript:

1 Technology Work book / Text book

2 Term # 3 Materials – Constraints Lab Mechanical Function – Links Lab Complex Mechanical Function – Gears Lab Noise Maker

3 Ch. 11: Materials 1.Mechanical Constraints 2.Mechanical Deformation

4 Text / Work Books Text Book - p. 368 Work Book - p. 195 Copy the following definitions

5 RAW MATERIAL – p. 195 A natural substance that must be transformed before being used to manufacture an object.

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7 MATERIALS A substance that has been completed or transformed by humans and is then used to make an object or its parts.

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9 EQUIPMENT Includes all instruments used to produce an object.

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11 A TECHNICAL OBJECT Is an object conceived and manufactured by humans to meet one or more needs or wants (p. 368)

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13 A MECHANICAL CONSTRAINT… Describes the stress produced within a material when it is subjected to external forces. (p. 369)

14 A MECHANICAL PROPERTY… Determines how a material will react when it is subjected to one or more mechanical constraints.

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16 Compression – p.370 Force that crushes materials

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19 Tension Force that stretches materials

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22 Torsion Force that twists materials

23 Example of Torsion

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25 Bending Force that bends materials.

26 Examples of Bending

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28 Shearing Force that cuts or tears materials.

29 Example of Shearing

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32 Elastic - p. 371 This results in a temporary deformation of the material. When the constraint is removed, the material regains its shape.

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34 Plastic Even when the constraint is removed The material remains deformed

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36 Fracture The material ruptures after being subjected to the constraint.

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38 Homework Pp

39 Activity # 1 Compression / Torsion / Deflection Get a partner Get a handout Get one box per table

40 Goal Observe the effects of various constraints on different types of materials

41 Materials Strip of Iron Strip of Polypropylene 3 Strips of Wood Bar Clamp Universal Clamp Retort Stand Ruler 1000-g weight with hook

42 Procedure Part A: Compression – Place the strip of iron between the jaws of the bar clamp and tighten the jaws – Loosen the jaws of the bar clamp and remove the strip of iron – Record the type of deformation you observe – Repeat steps 1 to 3 with the strip of polypropylene and wood


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