Slide 1

Section 2: Units, Scientific Notation, and SI Prefixes Slide 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!!! Slide 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 = Slide 4 Easy way for BIG numbers: 1) 2,000,000 = 2) 3900 = 3) 20.5 = 4) 49000000000 = Slide 5 How scientific notation is derived for small numbers: Ex) 3 x 10 -4 m 1/10 = 1/ 100 = 1/ 1000 = 3/1000 = Slide 6 Easy way for SMALL numbers 1).000345 2).009 3).000000007832 4).00000000000000000000002973 Slide 7 SI Prefixes: Used to express Very large and Very small numbers Examples: 1000km 30mg 55 cm 7.8 ns Slide 8 Slide 9 Zinc oxide balls used in solar panels used to scatter and trap light: 15nm across Slide 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 Slide 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