Physics: Chp 1 Sec 2
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Transcript of Physics: Chp 1 Sec 2
PHYSICS: CHP 1 SEC 2
Gman JooN
SI UNITS
Units MeasurementsMeters (m) LengthsKilograms (kg) MassSeconds (sec) TimeLiters (L) VolumeCandela (cd) Luminosity (brightness)
SCIENTIFIC NOTATION (SN)
1. Convert 94,344,000 into scientific notation.
2. 2100.25 into sn
3. Change 2.151 x 10-3
ACCURACY VS PRECISION
Accuracy = how close the results are to the target or accepted value.
Precision = how close the results are to each other. (the exactness of a measurement)
SIGNIFICANT FIGURES
The digits that are known with certainty plus the first digit that is uncertain.
SIG FIGSRules Examples
Zeros between non-zeros are significant
5.0123 (5) /// 10003 (5)
Zeros in front of non-zeros are not significant
0.0021 (2) /// 0.01101 (4)
Zeroes after the decimal point that are at the end of a number are significant
35.100 (5) /// 1.000 (4)
Zeroes at the end before decimals are only sig. if they have been measured.
1000 (1,2,3,4) /// 20 (1 or 2)
SIG FIGS CALCULATIONS
Add/Subtract: Look at decimal point of the one with the least # after decimal
Multiply/Divide: Look at the least # of Sig Figs.