1. External Forces
1.1. Gravity is the force that pushes on us.Even though you can barely feel this force it is only because you're used to it.
1.1.1. apple falling on someones head
1.1.2. dropping bowling ball
1.2. Push the force used to move something away from another.
1.2.1. doing pushups
1.2.2. pushing the door open
1.3. Pull the force used to make something closer to you.
1.3.1. doing situps
1.3.2. doing chinups
2. Stability
2.1. Centre of Gravity is the place where most of the weight of a object is.The lower the centre of gravity the more stable the object is.
2.1.1. football player lowering his centre of gravity
2.1.2. person making there centre of gravity higher
3. Loads
3.1. Static Loads are loads that receives continuous amount of force/gravity.
3.1.1. person standing still
3.1.2. computer
3.2. Dynamic Load is a force that is constantly applied to a structure.
3.2.1. tornado
3.2.2. earthquake
3.3. Live Load a structure that is being supported by the dead load it's on.
3.3.1. car
3.3.2. human
3.4. Dead Load a structure that is able to support itself and objects heavier than the structure itself.
3.4.1. bridge
3.4.2. CN Tower
4. Types of Structures
4.1. Frame Structures
4.1.1. Is usually use as a base of a shell structure to make it more sturdy. usually made with rods that connect.
4.1.1.1. picture frame
4.1.1.2. spider web
4.2. Shell Structures
4.2.1. Usually supported by a frame structure. an example of a shell structure is an igloo. shell structures are made for habitats and storing objects.
4.2.1.1. igloo
4.2.1.2. turtle shell
4.3. Combination Structures
4.3.1. Its has a bit of all structures combines with shell, frame, and solid structures. An example of a combination structure is a house.
4.3.1.1. house
4.3.1.2. water slides
4.4. Solid Structures
4.4.1. Solid structures is an object that stays in its form no matter if you use external or internal forces on it.
4.4.1.1. brick wall
4.4.1.2. hammer
5. Internal Forces
5.1. Compression
5.1.1. Its when you put something on top of another object on a flat surface and gravity puts compression the the object at the bottom. It can also be a person pushing on both sides of an object.
5.1.1.1. sitting on a chair
5.1.1.2. hugging a toy
5.2. Tension
5.2.1. Its when you stretch an object by pulling on it. It will create tension.
5.2.1.1. person doing a bow n arrow
5.2.1.2. doing yoga
5.2.1.3. pulling on a rubber band
5.3. Shear
5.3.1. Its when you bend an object or rip an object in any direction.
5.3.1.1. ripping paper
5.3.1.2. bending ruler
5.4. Torsion
5.4.1. Its when you twist something for example a rubber band. If you turn around you will feel torsion in you.
5.4.1.1. twisting a rubber band
5.4.1.2. twisting bottle open
6. Applying Forces
6.1. Magnitude
6.1.1. Its a size of what is hitting an object how much forces is used to hit that object.
6.1.1.1. hammer hitting nail
6.1.1.2. hitting someone
6.2. Direction
6.2.1. Its if your pulling an object closer or pushing an object farther from you.
6.2.1.1. playing tug of war
6.2.1.2. pushing food away
6.3. Point and Plane of Application
6.3.1. Its at what angle you hit an object at and where at the bottom, top , or middle if the object.
6.3.1.1. hitting someone on the head
6.3.1.2. wrecking ball hitting wall