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Chapter01 - Chapter 1 Units Physical Quantities and Vectors...

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Chapter 1 Units, Physical Quantities, and  Vectors
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3. Standards and Units SI ( Système International (french)) unit (or MKS unit) Time in s (second) Length in m (meter) Mass in kg An equation must be dimensionally consistent (be sure you’re “adding apples to apples”). “Have no naked numbers” (always use units in calculations).
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4.  Uncertainty and Significant  Figures Significant figures : all the digits that are known accurately + one estimated digit
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Rules Nonzero digits are always significant. Final or ending zeros to the right of the decimal point are significant. Zeros written to the right of the decimal point for the purpose of spacing the decimal point are not significant. Zeros written between significant figures are significant. Examples 409.9 s ( ), 0.058700 cm ( ), 9500 g ( ), 950.0 × 10 1 mL ( ) 0.0001054 kg ( ), 0.005800 cm ( ), 602000 s ( ) When ambiguous, use the scientific notation.
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7. Vectors and vector addition Vector quantity has a magnitude and a direction :
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