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.