NIS – PHYSICAL SCIENCE. Lecture 1 Methods of Science Ozgur Unal. NIS – PHYSICAL SCIENCE. Lesson objectives: Define science Identify the steps scientists often use to solve problems Determine dependent variables, independent variables and constants in an experiment. Scientific Method.
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Methods of Science
Identify the steps scientists often use to solve problems
Determine dependent variables, independent variables and constants in an experiment.
Science is a processthatusesobservationandinvestigationtogainknowledgeabouttheevents in nature.
Investigation:Includesobserving, experimenting, modelling
Investigationsfollow a general pattern: ScientificMethod
Hypothesis: Educatedguess, testableanswers
Experiment: A wayto test yourhypothesis
Question: Howdoesthethickness of theseedcoataffectthegermination rate of theseeds?
Temperature, amount of sunlight, wateretc.
Performtheexperiment, collectandrecordyour data:
A theory is an explanation of a set of related observations or events based upon hypotheses and verified multiple times by detached groups of researchers.
A theory is broader, moredetailedand can givetestablepredictions.
Doesmicrowavepopcorn pop betterwhen it has beenfrozen?
Construct a hypothesis
Design an experiment to determine whether microwave popcorn pops better when it has been frozen.
Standards of Measurements
A standardis an exactquantitythatpeopleagreetousetocomparemeasurements.
Themeasurement of anyquantity is maderelativeto a particularstandardorunit.
Thelength of an object is 2.3 meaningless
Ifpeople do not usecommonunits, confusionsareinevitable.
SI, InternationalSystem of Units, is widelyused in theworld.
SI, is based on multiples of ten.
A baseunitmust be defined in terms of a standard.
SI has 7 baseunits.
A conversionfactor is a ratiothat is equaltooneand is usedtochangeoneunittoanother.
Forexample, thereare 1,000 mL in 1 L.
1,000 mL = 1 L
or 1,000mL / 1L = 1
Toconvertone litre tomillilitre, usethisconversionfactor.