1. Forces
1.1. A push or pull affecting a structure by altering the structures shape, speed or direction.
1.1.1. External Forces
1.1.1.1. Forces not caused by the structure itself.
1.1.1.1.1. Static load
1.1.1.1.2. Dynamic load
1.1.2. Internal Forces
1.1.2.1. Forces that act on one part of a structure from the inside of the structure
1.1.2.1.1. Compression
1.1.2.1.2. Tension
1.1.2.1.3. Torsion
1.1.2.1.4. Shear
2. Structures
2.1. Center Of Gravity
2.1.1. Where most of the weight of the structure is located and where the structure's weight is balanced.
2.1.1.1. Cars
2.2. A Structure is an object that serves a purpose in our everyday lives.
2.2.1. Combination
2.2.1.1. Combination structures have all the different types of structures in it.
2.2.1.1.1. house
2.2.1.1.2. Human
2.2.2. Solid
2.2.2.1. Solid structures are structures that are not hollow and are solid.
2.2.2.1.1. Rocks
2.2.2.1.2. Bricks
2.2.3. Shell
2.2.3.1. Shell structures are hollow and weigh less. They are also not as dense.
2.2.3.1.1. Football/Soccer ball
2.2.3.1.2. Eggs
2.2.4. Frame
2.2.4.1. Frame structures are structures with a "skeleton" to support the weight of a structure and/or other forces.
2.2.4.1.1. Roller Coaster
2.2.4.1.2. Skeleton
2.3. How structures are designed
2.3.1. Function
2.3.1.1. The purpose of the structure
2.3.1.1.1. Boat
2.3.2. Form
2.3.2.1. How a structure is built depending on the function.
2.3.2.1.1. Boat