# Forces and structures

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Forces and structures

## 1. Forms& functions

### 1.1. Form is what the structure looks like and what materials it is made of.

1.1.1. form: frame of house and function: people inside a house because it is a shelter

## 2. External forces

### 2.1. External forces is when a force is applied from outside of a object.

2.1.1. Magnitude-is measure how strong the external forces is

2.1.1.1. earthquake

2.1.2. Direction of force- direction of the force being applied

2.1.2.1. a house in a tornado: represents

2.1.2.2. door open

2.1.2.2.1. tree falling on a structure show an external force affecting outside of structure

2.1.3. Point of application - the area where the force is being applied

2.1.3.1. SOMEONE ON A BOX

2.1.4. Plane of application - a flat surface in which a force passes through

2.1.4.1. box

## 3. Center of gravity

### 3.1. center of mass/where the weight is evenly spread and all sides must be even

3.1.1. example: a pyramid. the center of gravity is near the bottom. it is near the bottom because it has a very wide base.

## 4. Internal forces

### 4.1. Internal forces are when something cause a object to move.

4.1.1. Compression

4.1.2. Torsion

4.1.2.1. house in tornado shows compression- being pushed together, tension- it is pulling it apart, torsion- it is twisting the house, shear- it could break in half.

4.1.3. Tension

4.1.4. Shear

## 5. Types of structures

### 5.4. frame structure: frame of a house

5.4.1. structure: a house. it's a frame structure because of the frame they build before they build the house. it is a shell structure because of the bricks used to build it. it is a shell structure because it is hollow but can still support load