## 1. Newton's 3rd Law

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

### 1.2. Action and reaction act on different objects

## 2. Newton's 1st Law

### 2.1. 1) An object at rest would remain at rest

### 2.2. 2) An object in motion will continue to be in motion at a constant speed in the same direction

### 2.3. In the absence of a net force (i.e. forces are balanced)

2.3.1. For example...

2.3.1.1. A rock on a table

2.3.1.1.1. The rock's weight is pushing down on the table

2.3.1.1.2. The table's reaction force pushes it back (3rd law)

## 3. Newton's 2nd Law

### 3.1. The resultant forces acting upon an object is equal to the product of the mass and the acceleration of the object.

3.1.1. Basically, F=ma

3.1.1.1. SI unit for force: newton (N)

3.1.1.2. 1N = 1kg m s^-2

3.1.2. The direction of the force is the same as the object's acceleration

3.1.3. The direction of the free body is dependent on the resultant force

## 4. Turning Effect of Forces (Moments)

### 4.1. Is the product of

4.1.1. Force

4.1.2. Perpendicular distance

### 4.2. Can be

4.2.1. Clockwise

4.2.2. Anticlockwise

### 4.3. Rotational equilibrium

4.3.1. sum of anticlockwise moments = sum of clockwise moments