1. Section 2: Units, Scientific Notation, and SI Prefixes

2. Quantities – Types of measurements 7 SI Base Units 1. Length (m) 2. Mass(not weight) (kg) 3. Temperature (K) 4. Time (s) 5. Mole (mol) 6. Luminosity (cd –candela) 7. Electricity (amp – ampere) Derived Units Volume (m 3 ) Speed (m/s) Flow Rate (kg/s) Area (m 2 ) Force (N) Acceleration (m/s 2 ) Momentum (kgm/s) Magnetic Flux (T/m 2 ) And many many more!!!

3. Scientific Notation: Used to express very large or very small numbers. Example: 2 x 10 4 m How scientific notation is derived for larger numbers: 10 x 10 = 10 x 10 x 10 = 10 x 10 x 10 x 10 = 2 x 10 x 10 x 10 x 10 =

4. Easy way for BIG numbers: 1) 2,000,000 = 2) 3900 = 3) 20.5 = 4) 49000000000 =

5. How scientific notation is derived for small numbers: Ex) 3 x 10 -4 m 1/10 = 1/ 100 = 1/ 1000 = 3/1000 =

6. Easy way for SMALL numbers 1).000345 2).009 3).000000007832 4).00000000000000000000002973

7. SI Prefixes: Used to express Very large and Very small numbers Examples: 1000km 30mg 55 cm 7.8 ns

9. Zinc oxide balls used in solar panels used to scatter and trap light: 15nm across

10. NASA's Hubble Space Telescope reveals the center of the magnificent barred spiral galaxy NGC 1512 in all wavelengths from ultraviolet to infrared. The colors (which indicate differences in light intensity) map where newly born star clusters exist in both 'dusty' and 'clean' regions of the galaxy. 1 YM across

11. (Optional)Write the following without SI Prefixes 1) 2 km 2) 3 nm 3) 5320 ms 4) 2800 am 5) 40 Mg 6) 45 cm