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.
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.