# Science

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Science

## 1. Forces

### 1.1. What is a force?

1.1.1. something that we use to move an object in many ways or directions. We use some form of force almost every minute.

### 1.2. Effects

1.2.1. change a motion of the body

1.2.2. causes an object to move

1.2.3. change shape

1.2.4. accelerate/decelerate the speed of an object

1.2.5. change the direction of a moving object

1.2.6. deform an object

1.2.7. break an object

1.2.8. stop a moving object

### 1.3. How to measure a force

1.3.1. use a spring balance

### 1.4. Types

1.4.1. Frictional force

1.4.1.1. occurs when two surfaces/objects brush against each other

1.4.1.2. a lubricant can be added to an object to reduce friction

1.4.1.3. eg. When running, friction is needed. Without friction, we will slip and fall

1.4.2. Gravitational force

1.4.2.1. a force that pulls everything towards the center of the Earth

1.4.3. Magnetic force

1.4.3.1. occurs when a metal like iron/steel is placed close to a non-magnetic object like metal paper clips.

## 2. Pressure

### 2.1. What is pressure?

2.1.1. force per unit area

### 2.2. How to increase pressure

2.2.1. reduce area of object

### 2.3. How to decrease pressure

2.3.1. increase area of the object