2 What is the goal of Scientific Investigations? Are the heart of scienceProduce evidence that helps answer questionsMay lead to new questionsAdvance science
3 The Scientific Method-what are the steps? A generalized set of steps scientists followAsk a questionDo background researchConstruct a hypothesisTest your hypothesis by designing an experimentAnalyzing your data and drawing conclusionsReporting your resultsThere is no required pathway for the scientific methodSometimes steps are skipped, sometimes they are repeated
4 What is a hypothesis? Definitions: Potential answer to a question that can be tested by gathering information“an educated guess”
5 What makes a Hypothesis “Scientific” Not all hypotheses are created equalScientific hypotheses must meet two requirements:Must be testableMust be falsifiableTestableCan be tested with observations that agree or disagree with the hypothesisFalsifiableCan be shown to be false if it really is false
6 Is it possible to “prove” a scientific hypothesis? It takes just one exception to disprove a scientific hypothesisProving that a scientific hypothesis is true is essentially impossibleIn science we use the term support/supported to describe hypotheses that have never been disproven
7 What does a good experiment require? Experiments are controlled scientific studies of specific variablesVariables:Factor that can take on different valuesThere must be at least two variables in any experimentManipulated variable (independent variable)Variable that is changed by the researcherResponding variable (dependent variable)Variable that the researcher predicts will change if the manipulated variable changes
8 What is an experimental control variable? Controls are variables that must be held constant so they won’t influence the outcome of an experimentIf control variables are not held constant it is impossible to determine exactly what is causing your dependent variable to change
9 What is a “unit” and why are they important? Definition:A standard quantity used for measurementUnits were invented so people could communicate amounts to each otherFor communication to be successful, everyone’s idea of any unit of measure must be the same
10 What are SI units? SI stands for International System of Units We commonly refer to it as the Metric SystemAlmost all fields of science us metric units when gathering dataEasier to work with and convertBased on prefixes
12 Topic: Distance, Speed, and Velocity Unit 1: Chapter 1
13 What is Distance and how do we measure it? Definition:Describes how far it is from one point to anotherDistance is measured in units of lengthThe SI unit for length is the meter (m)Short distances are measured in centimeters (cm)Long distances are measure in kilometers (km)
14 What is Speed and how do we measure it? Definition:How fast or slow something movesSpeed determines how far something travels in a given amount of timeThe SI unit for speed is meters per second (m/s)Other common units for speedKilometers per hour (km/h)Miles per hour (mph)Centimeters per second (cm/sec)
15 What is average speed?Even if speed varies during a trip, it is possible to calculate average speedPractice:It took an airplane 3,600 seconds to travel 540 km. What was the average speed of the airplane?What is the speed of a car that traveled 75 km in 1.5 hours?
Your consent to our cookies if you continue to use this website.