## 1. First law

### 1.1. Object in Motion will stay in motion unless acted upon by an external force

### 1.2. Object at rest will stay at rest unless acted upon by an external force

### 1.3. Also known as the Law of Inertia

### 1.4. Examples:

1.4.1. A car will continue at the same speed unless it is slowed down by brakes or friction

### 1.5. Applications:

1.5.1. without seatbelts in cars, passengers would keep moving if the car were to suddenly stop

## 2. Third law

### 2.1. For every action there is an equal and opposite reaction

2.1.1. When an object exerts a force on a second object the second object exerts an equal and opposite force back on the the first

### 2.2. Forces always occur in pairs

### 2.3. Examples:

2.3.1. When walking, your foot pushes on the ground backwards, and the ground pushes you up and forward

2.3.2. When swimming your hands and feet push the water backwards, and the water pushes you forward

### 2.4. Applications:

2.4.1. Propusion in rockets

2.4.2. Machinery

## 3. Second Law

### 3.1. Focuses on how force, mass and acceleration are related

### 3.2. The acceleration of an object is directly proportional to the net force acting upon it and is inversly proportional to its mass

### 3.3. Force = Mass x Acceleration

3.3.1. Force is measured in Newtons (N), Mass is measured in Kilograms (kg) Acceleration is measured in metres per second squared (m/s/s)

### 3.4. Example:

3.4.1. Pushing a lighter box with the same amount of force with result in a faster acceleration than pushing a heavier bow

### 3.5. Applications:

3.5.1. Essential in calculating forces in engineering, rockets, vehicle design, e.t.c