1 / 13

Ch. 2 Sec. 1

Ch. 2 Sec. 1. Measures in Science. Metric System & SI Units. French Scientists adopted metric system in 1795 Metric system uses powers of 10 10 millimeter = 1 centimeter 10 centimeter = 1 decimeter 10 decimeter = 1 meter There are 7 base units. Base units Chart. Derived units.

eron
Download Presentation

Ch. 2 Sec. 1

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. Ch. 2 Sec. 1 Measures in Science

  2. Metric System & SI Units • French Scientists adopted metric system in 1795 • Metric system uses powers of 10 • 10 millimeter = 1 centimeter • 10 centimeter = 1 decimeter • 10 decimeter = 1 meter • There are 7 base units

  3. Base units Chart

  4. Derived units • Combination of the base units • Speed or velocity = meters per second, m/s • Energy = joule, kg m2/s2

  5. SI Unit Prefixes

  6. Scientific Notation • Able to make using really large or small numbers easier • Expressing decimal numbers in powers of 10 • N x 10n • Move decimal point until only one non-zero digit remains • Count the number of spaces and use that as exponent • Earth to Mars = 227 800 000 000m • 2.278 x 1011m • Mass of electron = 0.000 000 000 000 000 000 000 000 000 000 911 kg • 9.11 x 10-31kg

  7. Express in Sci. Notation • 5800 • 450 000 • 302 000 000 • 86 000 000 000 • 0.000 508 • 0.000 000 45 • 0.0003600 • 0.004

  8. Express in Sci. Notation • 5800 = 5.8 x 103 • 450 000 = 4.5 x 105 • 302 000 000 = 3.02 x 108 • 86 000 000 000 = 8.6 x 1010 • 0.000 508 = 5.08 x 10-4 • 0.000 000 45 = 4.5 x 10-7 • 0.0003600 = 3.600 x 10-4 • 0.004 = 4 x 10-3

  9. Converting Units • What is the equivalent in km of 670 m? • 1 km = 1000 m • (1000 m)/ (1 km) = 1 • Using a Conversion Factor you can determine the relationship between two units • Multiplier equal to one • 670 m = (670 m) (1 km / 1000 m) • (670 m x 1 km) / 1000 m = 0.670 km • Label units will cancel out

  10. Converting Units Practice • 1.1 cm  meters • 76.2 pm  millimeters • 2.1 km  meters • 2.278 x 1011 m  kilometers • 147 g  kilograms • 11 Mg  kilograms • 7.23 µg  kilograms • 478 mg  kilograms

  11. Converting Units Practice • 1.1 cm  1.1 x 10-2 m • 76.2 pm  7.62 x 10-8 mm • 2.1 km  2.1 x 103 m • 2.278 x 1011 m  2.278 x 108 km • 147 g  1.47 x 10-1 kg • 11 Mg  1.1 x 104 kg • 7.23 µg  7.23 x 10-9 kg • 478 mg  4.78 x 10-4 kg

  12. Adding and Subtracting in Sci. Notation • When adding or subtracting, make sure the powers of 10 are the same (10N) • 4 x 108 + 3 x 108 • (4 + 3) x 108 • 7 x 108 • (4.1 x 10-6) – (3.0 x 10-7) • (4.1 x 10-6) – (0.30 x 10-6) • (4.1 – 0.30) x 10-6 • 3.8 x 10-6

  13. Multiplying & Dividing in Sci. Notation • Multiply or divide the values and the units • Add (if multiplying) or subtract (if dividing) the exponents • (4 x 103 kg)(5 x 1011 m) • (4 x 5) x 103 + 11 kg•m • 20 x 1014 kg m  2 x 1015 kg m • (8 x 106 m3) / (2 x 10-3 m2) • (8/2) x 106– (-3) m(3-2) • 4 x 109 m • If units have powers, add or subtract accordingly

More Related