Download Notes - Section 2: Scientific Notation and SI Prefixes

Section 2: Units, Scientific Notation,
and SI Prefixes
Quantities – Types of measurements
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7 SI Base Units
Length (m)
Mass(not weight) (kg)
Temperature (K)
Time (s)
Mole (mol)
Luminosity (cd –candela)
Electricity (amp –
ampere)
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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!!!
Scientific Notation: Used to express
very large or very small numbers.
Example: 2 x 104m
How scientific notation is derived for larger numbers:
10 x 10 =
10 x 10 x 10 =
10 x 10 x 10 x 10 =
2 x 10 x 10 x 10 x 10 =
Easy way for BIG numbers:
1) 2,000,000 =
2) 3900 =
3) 20.5 =
4) 49000000000 =
How scientific notation is derived for small numbers:
Ex) 3 x 10-4m
1/10 =
1/ 100 =
1/ 1000 =
3/1000 =
Easy way for SMALL numbers
1) .000345
2) .009
3) .000000007832
4) .00000000000000000000002973
SI Prefixes: Used to express Very large
and Very small numbers
Examples:
1000km
30mg
55 cm
7.8 ns
Zinc oxide balls used in solar panels
used to scatter and trap light:
15nm across
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
(Optional)Write the following without SI
Prefixes
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2 km
3 nm
5320 ms
2800 am
40 Mg
45 cm