Measurements and Conversions

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Presentation transcript:

Measurements and Conversions

Metric Base Units Length – Meter (m) Mass – Gram (g) Volume – Liter (L) Time – Seconds (s) Temperature – Kelvin (K) Celsius (˚C) Conversion K = ˚C – 273.15 Current – Amp (A)

Physics or SI Base Units Length – Meter (m) Mass – Kilogram (kg) Volume – Liter (L) Time – Seconds (s) Temperature – Kelvin (K) or Celsius ˚C Electric Current – Amp (A)

SI Derived Units Velocity: (m/s) Acceleration: (m/s²) Density: (kg/L) Force: mass (kg) x acceleration (m/s²) = Newton (N) Energy and Work: Force (N) x Length (m) = Joule (J) Power: Work (J) / time (s) = Watt (W) Frequency: 1/s = Hertz (Hz) Electric charge = current (A) x time (s) = Coulomb (C)

Conversions for SI Units

Conversions for SI Units

Practice Problems Convert the following to SI base units: 10 g = .01 kg 6 km = 6,000 m 1000 mL = 1 L 7 minutes = 420 s 20 mA = .02 A 3000 mg = .003 kg 0.8 cm = .008 m Piece of Cake

Convert Standard to SI Units 1 mile = 1609 m 1 yard = .91 m 1 gallon = 3.79 L °F = °C × 9/5 + 32 1 lb. = .45 kg (only on Earth) 1 lb. = 4.4 N (everywhere)

Good Job! You did it! Practice problems 3.1 miles = 4987.9 m Convert the following to SI base units: 3.1 miles = 4987.9 m 80 ˚F = 26.7 ˚C 25 mph = 11.2 m/s 150 lb. = 68 kg (mass) 150 lb. = 667 N (force) 70 mph = 31.3 m/s Good Job! You did it!

Scientific Notation Scientific notation is the way that scientists easily handle very large numbers or very small numbers. For example, instead of writing 0.0000000056, we write 5.6 x 10-9. Speed of light: c = 299,792,458 m/s = 3.0 x 108 m/s Gravitational constant: G = 0.0000000000667 Nm2/kg2 = 6.67 x 10-11 Nm2/kg2

Scientific Notation Practice problems: 123,456,789.00 = 1.23 x 108 Wow!

Measuring Instruments Length: Meter stick, Ruler, Calipers, Tape measure Mass: Triple beam balance, spring scale, digital scale Volume: Graduated Cylinder Time: Stop watch Force: Spring scale, digital scale Temperature: Thermometer, Thermal couple Electrical current and charge: Multimeter

Name the Instrument Calipers Triple Beam Balance Stopwatch Meter stick Graduated Cylinder

Name The Instrument Thermometer Spring scale Thermocouple Multimeter