Measurement, Accuracy, and Significant Digits

Today we learnt about the metric system and that it has 7 fundamental units.

1. Meter (m)- Length
2. Kilogram (kg)- Mass
3. Seconds (s)- Time

4. Amphere (A)- Current

5. Mole (mol)- Amount

6. Kelvin (k)- Temperature

7. Candela (cd)- Luminosity Intensity

We also learnt about Prefixes used with the "Le systeme International d'Unites" = Si System.

Apple has used the word "Nano" to exaggerate the size of the ipod nano.

We also took notes on significant zero

1) If there is a decimal after the zero it is significant.

IE. 1020. 302980.

2) You must round to the least percise number

IE. 4212-3.54= 3.8812 S.D.s= 3.88

3) When you multiply and divide, round to the number with the fewest S.D.s

IE. 2.5x5.55= 13.875 S.D.s= 14

Near the end of class we watched two youtube videos. One of a bridge collapsing and the other a swing fail. http://www.youtube.com/watch?v=3q27dzRgHLo