# Structures

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Structures

## 1. Structure

### 1.1. Shell

1.1.1. A shell structure is a hollow structure

### 1.2. Solid

1.2.1. A solid structure is a structure made with a solid piece of material

### 1.3. Frame

1.3.1. A frame structure is a structure made of multiple parts

### 1.4. Combination

1.4.1. A combination structure is a structure with more than one type of structure combined, such as frame and shell

### 1.6. A ball and a USB cable are structures

2.1.2. The static load of a ten gram weight is ten grams

2.1.3. The static load of a five kilogram weight is five kilograms

2.2.1. A live load is a load that is able to move

2.2.2. That truck would be a live load on a bridge as it can move across the bridge and remove its load from the bridge

2.2.3. A live load on a chair would the person sitting on it as the person can move onto the chair and off the chair by itself

## 5. Forces

### 5.1. Internal

5.1.1. Compression

5.1.1.1. Definition: An internal force that presses and object to a point.

5.1.1.2. Squeezing a sponge is an example of compression because you're putting pressure on the sponge

5.1.1.3. Sitting on a chair is another example because you're putting pressure on the chair

5.1.2. Shear

5.1.2.1. Shear is a ripping or rubbing force on a structure

5.1.2.2. Shear is being applied when you rip a piece of paper apart

5.1.2.3. Shear can also be applied when a fruit falls from a tree

5.1.3. Torsion

5.1.3.1. Torsion is the twisting of a structure

5.1.3.2. Torsion is being applied on a rope when you twist it

5.1.3.3. Torsion is also being applied when you twist a rag to squeeze the water from it.

5.1.4. Tension

5.1.4.1. Tension is a structure getting pulled apart

5.1.4.2. Tension is put on an elastic band as you stretch it.

5.1.4.3. Tension is put on a suspension bridge when there is a load on it

5.1.5. Internal forces are forces caused by a structure exerting pressure on itself

### 5.2. External

5.2.1. External forces are forces caused from sources other than the structure itself

5.2.2. Gravity

5.2.2.1. Gravity is the pull of objects with large masses

5.2.2.2. The mass of the earth, sun and moon cause gravity

### 5.3. Describing

5.3.1. Plane of Appication

5.3.1.1. Plane of application is the angle at which a force is exerted

5.3.2. Point of Application

5.3.2.1. Point of application is where a force is exerted

5.3.3. Magnitude

5.3.3.1. Magnitude is how much power is exerted on an object

5.3.3.2. Soft is a magnitude as it is a very little amount of force being exerted

5.3.3.3. Hard is a magnitude as it is a lot of force being exerted