**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.

Measurement

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

Grams

Mass is measured using a triple beam balance

Mass of some common objects

Nickel = 5 grams

Baseball – 150 grams

Your textbook = about 1kg

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

Water freezes at 32o F

Fahrenheit boils at 212o