## Section 2: Methods of Science and Technology

Technology has had a huge impact on society and has helped make solving everyday problems easier. Technology is the application of science to solve problems.  For example, the invention of cars, buses, and airplanes has made traveling easier and helped shape the modern world.  New technology emerges as a result of technological design.  This process is used to develop new technologies relying on evidence and reasoning.

Steps of the technological design process:

1. Identify the problem
2. Research the problem
3. Generate solutions
4. Select the best solution
5. Create a model
6. Test the model
7. Refine and retest the model
8. Share results

All technological designs have physical and social limitations or constraints due to natural laws, materials used, ease of use, cost, and safety.

Scientific work often requires calculations to solve formulas or to convert to units.  This can be seen on a thermometer when you convert Celsius to Fahrenheit.

Scientific notation is a way of writing very large or very small numbers that use exponents.

Example:        a = 10b

a represents a decimal number

b represents an exponent, or power, of 10

Steps to convert to and from scientific notation:

1. Move the decimal point left or right until the last nonzero digit
2. Count how many places you move the decimal point
3. If the decimal moved left, b is positive; decimal moved right b is negative

Examples:  500 written with scientific notation is 5.0 x 102

0.05 written with scientific notation is 5.0 x 10-2