1. Measurements and Conversions

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

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

4. 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)

5. Conversions for SI Units
Practice problems on the notes.

6. Conversions for SI Units

7. 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

8. 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)

9. Good Job! You did it! Practice problems 3.1 miles = 4987.9 m
Convert the following to SI base units:
3.1 miles = 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!

10. Scientific Notation
Scientific notation is the way that scientists easily handle very large numbers or very small numbers. For example, instead of writing , 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 = Nm2/kg2 = 6.67 x Nm2/kg2

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

12. 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

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

14. Name The Instrument
Thermometer
Spring scale
Thermocouple
Multimeter