Presentation on theme: "Ms. Hirsh Physical Science"— Presentation transcript:
1 Ms. Hirsh Physical Science What is Science?Ms. HirshPhysical Science
2 Scientific 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
3 Parts 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
4 Example 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.
5 Theory 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
6 Branches 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