Scientific Notation
•
Express the following in scientific notation:
1.
2.
3.
4.
5,800 m
450,000 m
302,000,000 m
86,000,000,000 m
(continued)
Express the following in scientific notation:
1.
2.
3.
4.
0.000508 kg
0.00000045 kg
0.0003600 kg
0.004 kg
Accuracy
• Measure of how close a measurement comes
to the actual or true value.
Precision
• Measure of how close a series of
measurements are to one another
Determining Error
• Accepted Value- correct value based on reliable
references
• Experimental Value- value measured in lab
• (Relative) Error= Experimental – Accepted
• Percent Error= (Error/Accepted Value) x 100
Conversions
• Create a map of how you are going to get to
your destination unit.
• Write down the given.
• Create brackets and fill in units. (Units must be
diagonal in order to cancel.)
• Go back and fill in conversion factors.
• Compute the math and solve.
Common Conversion Factors
•
•
•
•
•
•
•
•
100 cm = 1 m
1,000 mm = 1 m
1 yd = 3 ft
1,600 m = 1 mile
12 in = 1 ft
µ - micro (10-6)
n - nano (10-9)
M – mega (106)
1,000 m = 1 km
1 cm = 10 mm
1 mile = 5, 280 ft
1 in = 2.54 cm
Examples
• 29 days  seconds
• 270 yd  inches
• 2.54 µm  km
• 7,420 nm  km
• 65 miles/hr  m/s
• 2,300 cm/s  miles/min
• You want to buy carpet for a room that is 20 ft
by 14 ft. How many square yards should you
buy?