1 / 24

Bellwork

Bellwork. On the left side of your notebook, write the measurements using the desired metric prefix: 2,400 gm = ______ kg 4 L = ______ mL 660 nm = __________ m 9.8 s = __________ ps. Physics. 9/13/13. What’s up today? Metric System Practice (if needed) Dimensional Analysis

zhen
Télécharger la présentation

Bellwork

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Bellwork • On the left side of your notebook, write the measurements using the desired metric prefix: • 2,400 gm = ______ kg • 4 L = ______ mL • 660 nm = __________ m • 9.8 s = __________ ps

  2. Physics 9/13/13 • What’s up today? • Metric System Practice (if needed) • Dimensional Analysis • How Many Light-years is your Pencil?

  3. Metric System • 5.42x106 m = ________ Mm • 4.20x10-5 m = ________ μm • 2.1x10-10 m = ________ nm = _________ fm

  4. Dimensional Analysis • Physicists don’t just add numbers…as wonderful and fascinating as they are. • How do we do math with units?

  5. Arithmetic • Rule 1: We can only add or subtract same units. Not okay: 20 kg + 300 m = ???

  6. Arithmetic • Rule 2: Multiplying or dividing with units results in…wait for it…

  7. Arithmetic • Rule 2: Multiplying or dividing with units results in…wait for it…multiplying or dividing with units. ]

  8. Arithmetic • Rule 3: Squaring or taking a root of a unit results in….

  9. Arithmetic • Rule 3: Squaring or taking a root of a unit results in….squaring or taking a root of a unit.

  10. Arithmetic • Rule 4: We cannot have a unit in the argument of an exponential, log, or trig function.

  11. Unit Conversion • How to convert from one unit to another?

  12. Unit Conversion • How to convert from one unit to another? • Chaining! • Go from m to cm to mm:

  13. Unit Conversion • Chemistry:

  14. Your turn. • Rest of class: activity time. • Read instructions, perform measurements in small groups. • If an instrument is being used, skip and come back. • Ask Mr. Abbott for help!!!!!

  15. Scientific Notation • In physics, we use some very BIGand some very small numbers. • Charge of an electron: .000000000000000001602 C • Distance to the Sun: 149,700,000,000 m

  16. Scientific Notation • There has to be a better way!

  17. Scientific Notation • There has to be a better way! • Scientific notation. • Taking advantage of the “powers” of powers of ten…

  18. Scientific Notation • Easy example: • Write 2,000 in scientific notation. • Easy-ish: • Write 20,200 in scientific notation. • Not-quite-as-easy: • 299,800,000 • Tough-ish: • 0.00000913

  19. Scientific Notation • Want more detail? • Base-ten number system: ANY number in the system can be represented by adding multiples of powers of ten: 22,531 • Base-two number system: binary code. 001101

  20. Scientific Notation • Convenience of base-ten? • Can ALSO represent any number as a number b/w 1 and 10 multiplied by some power of ten:

  21. Metric System • The metric system takes advantage of powers of ten to make it easier to express units. • Every power of ten (103, 106, 10-3) has it’s own prefix (kilo, mega, milli).

  22. Metric System • The metric system takes advantage of powers of ten to make it easier to express units. • Every power of ten (103, 106, 10-3) has it’s own prefix (kilo, mega, milli). • Activity time!

  23. Next time… • Dimensional analysis. • How many lightyears long is a pencil?

  24. Roadmap: • After dimensional analysis, we move into basic math (functions and graphing). • THEN we start talking MOTION! Huzzah!

More Related