1. Fundamental & Derived Units

2. 7 Base/Fundamental Units
Unit Symbol Dimension
Meter m length definition
Kilogram ___ ______ amt matter.
Second ___ ______ __________.
Ampere ___ ______ __________.
Kelvin K ______ __________.
Mole mol ___________________.
Candela cd intensity of light.

3. Derived Units: Combos of base
Mechanics – motion, force, matter. All units derived from kg, m, s.
Ex: density, velocity.

4. Remind yourselves of the metric prefixes. See Hamper pg 6.

5. 1. What are the base units of Joules?
kg m2 s-2.

6. 2. What unit is a C/s?
Ampere

7. 3. What quantity is represented by the base unit below?
kg m2
s3 A
Volts

8. 4. Break down the unit W (ohm) into base units.
kg m2 s-3 A-2.

9. Order of Magnitude & Estimation
Physics must explain the very large & the very small.

10. The universe ~10 25 m across. It is ~ 15 BY old.
How many seconds is that?
~ seconds

11. The power of 10 is order of magnitude.
Useful for estimation of the very large & very small.

12. Diameter: Atom ~ 10 – 10 m Nucleus ~ 10 – 15 m What is the ratio between the two?
10 5.

13. Wavelength of light few hundred nm (400 – 700) Frequency light ~ 4 – 8 x 1014 hz.
Try to memorize the previous quantities.
See list on pg 1 in Kerr.

14. Hwk: Read Hamper 1 – 6. Do pg 3 - 6 # 1 – 7 Show work or write word.
Write your whole name.
Date.
Assignment.
Label questions.
Show work.

15. Make estimations in groups outside.

16. Do Now: How may cm3 in 4 m3?

17. Go to next ppt.