Measurements   units
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Measurements units

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Measurements   units Measurements units Presentation Transcript

  • Measurements and Units Quantities and Units
  • Quantities and Units
    • Form sentences with these quantities:
    3m 2 65km/h 1.76m
    • Physical Quantities are measurable and have physical (feel, see…) meaning.
    Quantities and Units Numerical Value Unit 4.5 m
  • Quantities and Units
    • There are many units for each quantities
    • Example - Length:
    • metres, centimetres, kilometres, feet, inches, miles, nautical miles, light year
    • Only one of the many is an SI unit
  • Quantities and Units kg Kilogram Mass K Kelvin Temperature s Second Time m Metre Length Symbol SI Unit Quantity
  • Quantities and Units
    • SI units for some other quantities.
    • When solving questions involving quantities. These quantities must have the same unit.
    kg/m 3 density m 3 volume m 2 area m/s speed Unit Quantites
  • Quantities and Units
    • Example
    • 400 cm 3 of water is added to 1 litre of water. How much water is there?
    • Incorrect: 400 + 1 = 401cm 3
    • Correct: 1 litre = 1000cm 3
    • 400 + 1000 = 1400 cm 3
  • Quantities and Units
    • Very small numbers may have prefixes to make writing them easier.
    • Example
    • 2 000 000 000 Byte = 2 GByte
    • 0.000045 m = 45  m
  • Quantities and Units One billionth One millionth One thousandth One hundredth One tenth One thousand One million One billion Value n nano µ Micro m Milli c Centi d Deci K Kilo M Mega G Giga Symbol Prefix
  • Conclusion
    • Numerical values and units give quantities meaning.
    • Only quantities that have the same units can be added or subtracted.
    • Prefixes may be added to very small quantities.