# Forces and Structures

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Forces and Structures

## 2. Form and Functions

### 2.1. Functions: it is what the structure is designed to do.

2.1.1. Bridge: A bridge helps hold people,cars, trucks and etc.

2.1.1.1. when a car drives on the bridge that causes the bridge to hold more weight up.

2.1.2. A cup:A is to help hold liquid like coffee, music and etc

2.1.2.1. when liquid is poured into the cup that causes the cup to hold to liquid in place so it doesn't spill.

## 3. Internal Forces

### 3.1. An internal force makes a structure change shape. Internal forces happen because of external forces.

3.1.1. When a person applies an external force by stretching a rubber band, they create tension, something stretched.

### 3.2. There are four types of internal forces.

3.2.1. Shear is when a structure breaks from receeiving pressure in different places.

3.2.1.1. Same with the branch.

3.2.2. Torsion is when the structure twists.

3.2.2.1. The skater spins and creates torsion: external to internal

3.2.3. Compression is when a structure gets squeezed.

3.2.3.1. The soccer ball gets compressed. The ground and the foot pushes/pulls it.

3.2.4. Tension is when a structure stretches.

3.2.4.1. This person stretches their musselss.

## 4. External Forces

### 4.1. An external force is a force from the outside of the structure.

4.1.1. The result depends on four factors: the magnitude, point of application, the plane of application, and the direction.

4.1.1.1. The magnitude determines how strong the force is.

4.1.1.1.1. A poke is a weak force.

4.1.1.2. The direction determines which way an object is applied. Wether it is a push away from the applier of the force or a pull, vice versa.

4.1.1.2.1. You can pull an object to yourself, like keeper hugging a ball.

4.1.1.3. The plane of application determines the angle at which the force is applied, primarily 180, 90, or 45 degrees.