unit 4 science

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Across
  1. 3. a structure that is a frame
  2. 6. where force is applied
  3. 9. margin of safety
  4. 11. a structure that is mostly solid
Down
  1. 1. a structure that is cheap and hollow
  2. 2. a structure that puts weight on lower parts
  3. 4. a downward that varies depending on where you are
  4. 5. pressure exerted on something
  5. 7. there are 10 of these in a kilogram
  6. 8. the simplest type of bridge
  7. 10. a bridge that uses triangles as a truss