SAASTE Technology/Activities/Forces

SAASTE Technology
Key Concepts
Grade 4 - Grade 5 - Grade 6 - Grade 7 - Grade 8 - Grade 9
Modules
Processing Grade 8/9 - Mechanical Systems Grade 9 - Structures Grade 5 - Structures Grade 8
Activities
Conductors & Insulators - Electronic Circuits - AND & OR Gates - Circuit/Systems Diagram - Hydraulics - Hydraulics & Pneumatics - Technological Products - Preservation-1 - Identifying Materials - Properties of Materials - Preservation-2 - Electroplating - Conditioning-Strengthening/Waterproofing-1 - Conditioning-Strengthening\Waterproofing-2 - Shaping - Forming - Forces - Types of Structures - Mechanisms Worksheet

Structures

Grade 8

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Understanding Forces

When a material bends the two forces we talked about above can be seen in the material

Use an eraser (or similar object) and draw evenly spaced lines on the side. Bend, by applying upward pressure with the thumbs at arrow A and downward pressure at arrows B.

Refer to Fig: 1 and answer these questions. 1. What is causing the bending in the material?

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2. What would you call the OBJECT that is being bent?

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3. The drawing below shows a piece of metal which was struck by a cricket ball. Use your knowledge of forces and indicate on the drawing, where the metal has experienced the forces of compression and tension.

4. A material that is being stretched is said to be in:

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5. A material that is being squashed is said to be in:

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Author: Deon Kahn

Editor: Osman Sadeck