Physics Units. I. Physics SkillsII. MechanicsIII. EnergyIV. Electricity and MagnetismV. WavesVI. Modern Physics. I. Physics Skills. A. Scientific NotationB. GraphingC. Significant FiguresD. UnitsE. PrefixesF. Estimation. A. Scientific Notation. Use for very large or very small numbersWrite number with one digit to the left of the decimal followed by an exponent (1.5 x 105)Examples: 2.1 x 103 represents 2100 and 3.6 x 10-4 represents 0.00036.