# Force and Pressure

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Force and Pressure

## 1. FORCE

### 1.1. a push or pull

1.1.1. lifting

1.1.2. bending

1.1.3. stretching

1.1.4. twisting

1.1.5. squeezing

### 1.3. can see its effect

1.3.1. change in size

1.3.2. change in shape

1.3.3. change in speed

1.3.4. start a object moving

1.3.5. change direction of an object

## 2. TYPES OF FORCES

### 2.1. gravitational force

2.1.1. weight

2.1.1.1. depends on the force of gravity acting on it

2.1.1.2. greater the force of gravity = increase object

2.1.2. pulls all object down to earth

2.1.3. also know as gravity

2.1.4. exist between 2 objects

### 2.2. magnetic force

2.2.1. attracts magnetic materials

2.2.2. exerted on other magnets

2.2.3. used in transportation

2.2.3.1. Maglev train

### 2.3. frictional force

2.3.1. when 2 moving objects are in contact

2.3.2. also known as friction

2.3.3. stops a moving object

2.3.4. produces heat

2.3.5. reducing friction

2.3.5.1. smooth surface

2.3.5.2. ball bearings

2.3.5.3. lubricants

2.3.5.4. streamlining

3.3.1. area

3.3.2. force

## 4. CALCULATION

### 4.3. SI unit

4.3.1. Pascal (Pa)

### 4.4. unit of area

4.4.1. square centimetre (cm²)

### 4.5. unit of pressure

4.5.1. Newton per square centimetre (N/cm²)

### 4.6. 1 Newton

4.6.1. 0.1kg x 10

### 4.7. unit of force

4.7.1. Newton (N)

### 4.8. measuring force

4.8.1. spring balance