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MEASUREMENTS AND CONVERSIONS

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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)

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PHYSICS OR SI BASE UNITS Length – Meter (m) Mass – Kilogram (kg) Volume – Liter (L) Time – Seconds (s) Temperature – Kelvin (K) Electric Current – Amp (A)

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SI DERIVED UNITS Velocity: (m/s) Acceleration: (m/s²) Density: (kg/L) Force: mass (kg) x acceleration (m/s ² ) = 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)

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CONVERSIONS FOR SI UNITS

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PRACTICE PROBLEMS Convert the following to SI base units: 1. 10 g =.01 kg 2. 6 km = 6,000 m 3. 1000 mL = 1 L 4. 7 minutes = 420 s 5. 20 mA =.02 A 6. 3000 mg =.003 g 7. 0.8 cm =.008 m Piece of Cake

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CONVERT STANDARD TO SI UNITS 1 mile = 1609.34 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)

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PRACTICE PROBLEMS Convert the following to SI base units: 1. 3.1 miles = 4989 m 2. 80 ˚F = 26.7 ˚C 3. 25 mph = 11.2 m/s 4. 150 lb. = 68 kg(mass) 5. 150 lb. =667 N(force) 6. 70 mph = 31.3 m/s Good Job! You did it!

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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 10 8 m/s Gravitational constant: G = 0.0000000000667 Nm 2 /kg 2 = 6.67 x 10 -11 Nm 2 /kg 2

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SCIENTIFIC NOTATION Practice problems: 123,456,789.00 = 1.23 x 10 8 0.00987654321 = 9.88 x10 -3 0.00000789320 = 7.89 x 10 -6 821640732.200 = 8.21 x 10 8 0.00000100100 = 1.00 x 10 -6 1309000.02000 = 1.31 x 10 6 6780003.99000 = 6.78 x 10 6 0.00070900000 = 7.09 x 10 -4 Wow!

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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

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NAME THE INSTRUMENT CalipersTriple Beam Balance Stopwatch Graduated Cylinder Meter stick

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NAME THE INSTRUMENT Spring scale Thermometer Thermocouple Multimeter

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