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

2. Content Videos
Star Size: ideoId=HEheh1BH34Q Powers of 10: ideoId=qxXf7AJZ73A

3. Quantities – Types of measurements
7 SI Base Units
Length (m)
Mass(not weight) (kg)
Temperature (K)
Time (s)
Mole (mol)
Luminosity (cd –candela)
Electricity (amp – ampere)
Derived Units
Volume (m3)
Speed (m/s)
Flow Rate (kg/s)
Area (m2)
Force (N)
Acceleration (m/s2)
Momentum (kgm/s)
Magnetic Flux (T/m2)
And many many more!!!

4. Vectors and Scalars
Vectors: Quantities that have both a magnitude “how much” and direction.
Examples:
Forces
Velocity
Momentum
Scalars: Quantities that only have a magnitude.
Examples:
Mass
Time
Energy

5. Scientific Notation: Used to express very large or very small numbers.
How scientific notation is derived for larger numbers: 2 x 104m is the same as 20,000m
Examples:
3.43x103

6. How scientific notation is derived for small numbers: Example: 1
How scientific notation is derived for small numbers: Example: 1.99x10-4 means
Examples: = 4.33x10-4 =

7. Mixed Problems
Write in Scientific Notation
Write as regular number:
.00932
33200
5.83x102
2.55x10-5

8. SI Prefixes: Used to express Very large and Very small numbers Examples: 1000km = ________________m 30mg = __________________g 55 cm = __________________m 7.8 ns = __________________s

11. Small Chart of Kilotons / Large Chart Megatons

12. Tsar Bomb Video

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

14. 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

15. (Optional)Write the following without SI Prefixes
2 km
3 nm
5320 ms
2800 am
40 Mg
45 cm

16. Accuracy vs. Precision
Accuracy: How close a measurement is to the true value
Precision: How close repeated measurements are to each other.

17. What do you think of? Accuracy or Precision?

18. What do you think of? Accuracy or Precision?