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Scientific Method and SI Units

Measurement & Lab Safty Quiz Review

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The Scientific Method involves a series of steps that are used to investigate a natural occurrence. We shall take a closer look at these steps and the terminology you will need to understand before you start a science project.

QUESTION
RESEARCH
HYPOTHESIS:
PROCEDURE:
DATA:
OBSERVATIONS:
CONCLUSION

  • Problem/Question/Purpose

  • Observation/Research

  • Formulate a Hypothesis

  • Experiment/Procedure

  • Collect Data and Analyze Results

  • Conclusion

  • Communicate the Results

Measurement Facts Reviewed in Class

  • What is common measurement of a: Volume, Mass, Distance?
  • Mass is the measurement of how much matter an object contains
  • Are mass and weight the same thing?
  • What do we use in our lab to Mass object?
  • Examine you triple beam balance. What is each beam for?
  • What is the least and most mass you can mass on it?

SI Units For: Measurement

  • Measuring Mass: Mass is the measurement of how much matter an object contains

  • We use a triple beam balance to measure mass.

  • Are mass and weight the same thing?

    • Mass vs. Weight
      Weight is a measure of the force of gravity on you

    • Mass does not change.

    • An object’s weight will change if you move it from Earth to the moon or to other planets.

      • Weight = mass x gravity
        Gravity = 9.8 m/s2

  • Mass is measured in kilograms
    A smaller unit is also used

  • Grams
    Mass is measured using a triple beam balance

    Volume

  • The amount of space that occupies matter
    Volume is measured in several units
    Liters (L)
    Milliliters (mL)
    Cubic centimeters (cm3)

  • For rectangular objects, volume can be found by multiplying the measurements of length, width, and height
    Volume = length x width x height

Length

  • Length is measured in meters
    Meter (m)
    Kilometer (km)
    Centimeter (cm)
    1 kilometer = 1,000 meters
    1 centimeter = .01 meters

  • Length is measured using a meter stick or a ruler

Temperature

  • Temperature is measured in degrees Celsius (oC)

Water freezes at 0o Celsius

Boils at 100o Celsius

Mass vs. Weight

  • Weight is a measure of the force of gravity on you
  • Mass does not change.
  • An object’s weight will change if you move it from Earth to the moon or to other planets.
  • Weight = mass x gravity
  • Gravity = 9.8 m/s2
  • Units of Mass
  • Use SI units
  • Mass is measured in kilograms
  • A smaller unit is also used

SI prefixes

1 000 000 000 000
1 000 000 000
1 000 000
1 000
100
10
1

0.1
0.01
0.001
0.000 001
0.000 000 001
0.000 000 000 001
0.000 000 000 000 001
0.000 000 000 000 000 001
0.000 000 000 000 000 000 001

tera-
giga-
mega-
Kilo-

Hecto-

Deca-

Meter, Gram,or Liter

Deci-

Centi-
Milli-

Micro-
Nano-

pico-
femto-
atto-
zepto-

Addtional Resources listed below....