# 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