Chapter 1 The Scientific Method by kellena99

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									              Chapter 1
         The Scientific Method
I.   The Scientific Method
     A. Purpose
          State the Problem
          make observations
          form hypothesis
               if this happens, then this will


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B. Perform Experiment/Procedure
     1. Variables-different factors
          Controlled= kept the same
          Manipulated=changed
          (only one changed at a time)
          Responding=observed for results
     2. Repeated many times
        Must have clear procedure
        So others can repeat

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C. Collect & Record Data/Results
    = Measurements & Observations
    Organize in Tables & Graphs

D. Draw Conclusions
     Explain why you got results
Law = What always happens
description of scientific phenomena
Hypothesis → Theory if tested many times
& supported – tells why something happens
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II. Measurement
   A. International System/SI System
       Metric System
   mks System (meters/kilograms/seconds)

Kilo- hecto- deka- meter deci- centi- milli-
                   gram
                   liter


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To convert from one unit to another,
use Unit Cancellation.

Examples:
1. 8.50 lb = ? Kg

2. 2.9 L = ? qt

3. 55 mi/hr = ? Km/min

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III. Velocity
= rate of change in distance

          Velocity = distance/time
                   v = d/t
              SI unit is m/sec
Distance/Time graph (slope is velocity):




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Example Problems:

1. What is the average velocity in km/sec if it
  takes half an hour for a car to drive 22
  miles north?




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2. A cheetah’s speed is 25 m/sec. How
  many kilometers does it travel in 1 minute?




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3. How many minutes would I travel if I
  drove 145 km at an average velocity of 65
  miles/hour?




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Quiz Next Week:
Know basic units of International System
Convert measurement units using unit
 cancellation (tables will be given)
Given motion information for a
 vehicle, sketch a distance/time graph
Given information about an
 experiment, identify the
 hypothesis, manipulated
 variable, responding variable, and
 controlled variables.
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