Structures and Forces

4. An internal force that acts by pulling the particles of an object apart in exact opposite directions.
7. An internal force that acts in an object when the object is twisted.
8. An internal force that occurs when forces push or pull in opposite directions within an object.
9. An internal force that presses the particles of a object together.
10. A solid structural component that stands vertically by itself. Often used to support beams.
11. A ________ structure has a hollow, often curved, shape. An example would be a water bottle.
14. Beaver dams and bird nests are examples of __________ structures.
16. A ________ structure uses a network or skeleton of materials that support each other. An example would be a spider web.

1. A flat, horizontal structural component that is supported on both sides.
2. Forces that come from within the structure itself are called ________ forces.
3. A __________ is a push or a pull.
5. A _________ structure is made of one single construction material with no space inside. An example would be a concrete dam.
6. A curved structural component commonly found in Roman architecture.
11. A building, or other object, constructed with several parts.
12. Forces that come from outside the structure and act on the structure from the outside are called _______ forces.
13. The center of _________ is the point around which a structure’s mass is equally balanced in all directions.
15. A framework of beams that are joined together, usually in the form of interlocking triangles.