## 1. Physics is the study or the interactions between physical systems. (Energy and matter in space and time)

## 2. Scientific Notation

### 2.1. Is the way that scientists easily handle very large numbers or very small numbers.

2.1.1. Example: 3.6 x10^3

## 3. Operations in Scientific Notation

### 3.1. In the addition and subtraction the x has to have the same exponent.

3.1.1. Example: (5.7x10^4)+(4.87x10^5): 5.44x10^5

### 3.2. In the multiplication the exponent of x is added with the other.

3.2.1. Example: (3.4x10^-2)]6.2x10^6): 6x10^7

### 3.3. In the division the exponent of x is a subtraction.

3.3.1. Example: (8.4x10^5)/(1.4x10^-2): 6x10^7

## 4. Exponents

### 4.1. It says how many times to use the number in a multiplication.

4.1.1. Example: 8^2 (8 to the second power) = 8x8=64

## 5. Units

### 5.1. A unit of measure is a standardised quantity of a certain physical quantity.

## 6. Systems of Units

### 6.1. Systems used in science, industry and medicine.

6.1.1. Metric System SI

6.1.1.1. Distance: m, km.

6.1.1.2. Área: m^2, cm^2.

6.1.1.3. Volume: m^3, cm^3, lt.

6.1.1.4. Mass: kg, g

6.1.1.5. Time: s, min, h.

6.1.1.6. Temperature: ºC, K.

6.1.1.7. Velocity: km/h, m/s.

6.1.2. English Imperial System

6.1.2.1. Distance: yd, mile, ft.

6.1.2.2. Área: yd^2, mile^2, in^2, ft^2.

6.1.2.3. Volume: gal, ft3, in^3

6.1.2.4. Mass: ounce, lb.

6.1.2.5. Temperature: ºF.

6.1.2.6. Velocity: miles/h, yd/s, ft/s.