# Structures and forces

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Structures and forces

## 2. Types of Structures

### 2.1. Shell Structure

2.1.1. A shell structure is hollow but strong on the inside.

### 2.2. Solid Structure

2.2.1. A solid structure is solid all the way through.

### 2.3. Frame Structure

2.3.1. A frame structure are parts put together.

### 2.4. Combination Structure

2.4.1. A combination structure is a combination of all the other types of structures.

3.1.1. The force acting on an object

3.2.1. The living force on an object

3.3.1. The force of gravity acting on the structure itself

## 4. Internal & External Forces

### 4.1. Internal forces

4.1.1. torsion

4.1.1.1. a twisting motion applied to a object

4.1.2. tension

4.1.2.1. an internal force pulling the particles of a object apart

4.1.3. shear

4.1.3.1. when two forces in a object push or pull in opposite directions

4.1.4. Force acting between two parts of a body

4.1.5. compression

4.1.5.1. a internal force that presses particles of a object together

### 4.2. external

4.2.1. gravity

4.2.1.1. gravity is an external force that acts on a structure

4.2.2. a force acting on an object or structure from the outside

## 5. Cn tower

### 5.4. It migh experience compression and tension

5.4.1. This tower can experience com

### 5.5. Purpose

5.5.1. Tourist attraction

## 6. Application and Forces

### 6.1. Magnitude

6.1.1. the strength of a forrce

### 6.2. Point of applications

6.2.1. the location where an external force is applied

### 6.3. Plane of applications

6.3.1. an imaginary flat surface where an implied force passes

### 6.4. Weight

6.4.1. the force of gravity acting downwards on a object and is measured in newtons

### 6.5. Mass

6.5.1. the quantity of matter in a object and is measured in grams and kilograms