Classifying Words Related To Structures

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Across
  1. 1. The amount a thing weighs
  2. 3. A hollow structure with a curved shape providing high strength
  3. 5. The purpose of a part
  4. 8. A network of parts that supports loads
  5. 10. Stable
  6. 13. something of many parts that is put together
  7. 14. A force acting parallel to a surface or cross-section of a body
  8. 15. The force that pulls objects to one another
  9. 16. Set away from the surface
Down
  1. 2. Pulling
  2. 4. A push or Pull
  3. 6. Twisting
  4. 7. Pushing
  5. 9. The amount of matter in an object
  6. 11. The external appearance of something
  7. 12. Set on the outside