1. Physics Chp 1

2. Metrics K kilo 103 unit 100 = 1 c centi 10-2 m milli 10-3 μ micro 10-6 n nano 10-9 p pico 10-12

3. largest prefix gets a 1 and the smaller gets the absolute power difference Ex. Convert 32 cm to Km. 32 cm x ( 1 Km / 105 cm) = 3.2 x 10-4 Km

4. Precision vs Accuracy
Precision is how close are the measurements/calc to eachother.
Accuracy is how close the answer is to the accepted value
Target idea

5. Significant Figures
Ex , 0.076, 100, 15.3
Math - multi and divide, least sig. figs.
41 x 0.03 =
210 / 5.01 =
add and subtract- least dec. pts.
62 – 5.5 = =

6. Scientific Notation
A way to write really large or small numbers
= 1.5 x 105
= 4.3 x 10-5
Only the sig. figs. are used in sci. notation
Be careful when adding/subtracting, make sure powers are equal