Presentation on theme: "Ms. Hirsh Physical Science"— Presentation transcript:
1Ms. Hirsh Physical Science What is Science?Ms. HirshPhysical Science
2Scientific Method (5 Steps) An organized plan for gathering, organizing and communicating informationUsed to solve a problem or better understand an observed eventObservation/Question Hypothesis Controlled Experiment Data Collection Conclusion
3Parts to a Good Experiment Whenever possible, a hypothesis should be tested by an experiment in which only one variable is changed at a time. All other variables should be kept unchanged or controlledControlled Experiment – Only 1 variableControl – the factors in an experiment that remain the same and do not changeVariable – the factors in a experiment that change. A good experiment only contains 1 variableManipulated Variable – Variable that deliberately changesResponding Variable – Variable that changes in response to the manipulated variable
4Example Experiment Plants grow best under green light 10 basil plants are started from the seed and grown under various types of light5 are grown under white light and 5 are grown under green lightAfter several weeks the plants are measured and the average height of the plants are recordedWhat is the variable (the part of the experiment that changes)?Variable – green lightManipulating variable – green lightResponding variable - plant growthWhat is the control (the parts of the experiment that are kept the same)?Control – white light, # and type of plants, amount of water, sunlight, temperature, ect.
5Theory verse LawAs evidence from an investigation builds up, a hypothesis may become so supported that scientists consider it a theoryHypothesis – scientific testable explanation for an observation or phenomenonTheory – Well tested explanation for a set of observationsSubject to change, may be revisedNever proved, only disprovedWidely accepted by scientific communityLaw – Statement that summarizes a pattern in natureLaw states how something will behave and a theory explains how it works***REMEMBER*** theories and laws are not absolute, science is always subject to change
6Branches of ScienceChemistry – composition, structure, properties and reactions of matterPhysics – matter and energy and interactions between the two through forces and motionGeology – origin, history and structure of earthAstronomy – universe beyond earthBiology – origin and behavior of living thingsPhysical science – physics and chemistry