SAASTE Technology/Activities/Forces

Structures Grade 8 Understanding Forces Image:SA_NC_Saaste_Activities_29.png 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. Image:SA_NC_Saaste_Activities_30.png Refer to Fig: 1 and answer these questions. 1. What is causing the bending in the material? .............................................................................................................................................. .............................................................................................................................................. 2. What would you call the OBJECT that is being bent? .............................................................................................................................................. .............................................................................................................................................. 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. Image:SA_NC_Saaste_Activities_31.png 4. A material that is being stretched is said to be in: .............................................................................................................................................. .............................................................................................................................................. 5. A material that is being squashed is said to be in: .............................................................................................................................................. .............................................................................................................................................. Author: Deon Kahn Editor: Osman Sadeck