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Scientific Method and SI Units

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The SCIENTIFIC METHOD is the logical way in which a scientist goes about trying to solve a problem.  A student needs to understand the scientific method, and the words that are used to describe the process.  The actual descriptions of the steps of the scientific method will vary from text to text, but the underlying process remains the same.  The steps of the scientific method are shown below:

Purpose, Research, Hypothesis, Experiment, Analysis, Conclude

State the problem.
Collect observations.
Form a hypothesis.
Test the hypothesis.
Form a conclusion.
Modify a your conclusion.


What is common measurement of a: Volume, Mass, Distance?
Measuring Mass
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?
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
Mass is measured using a triple beam balance
Mass of some common objects
Nickel = 5 grams
Baseball – 150 grams
Your textbook = about 1kg

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 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 is measured in degrees Celsius (oC)
Water freezes at 0o Celsius
Boils at 100o Celsius
Water freezes at 32o F
Fahrenheit boils at 212o