Warm-up What is Science??? Search for ANSWERS with OBSERVATION and STUDY WHY??? Solve problems, answer questions, make the world better Observation and Inference Observation is an act or instance of observing a custom, rule, or law; an act of recognizing and noting a fact or occurrence often involving measurement with instruments (using the 5 senses) Inference is the act or process of inferring; a conclusion or opinion that is formed because of known facts or evidence Observation or Inference??? Object A – basketball??? Object A – round and orange??? Inference Observation Object B – tennis ball??? Object B – green, round, fuzzy??? Inference Observation Object C – round, black and white??? observation Object C – is larger than object B??? observation Qualitative or Quantitative Qualitative – Quality - Yes or No – Good or Bad Quantitative – Quantity – How much – an exact amount That picture is beautiful??? Qualitative - Good That hamburger was fantastic??? Qualitative - Good The Yankees scored 8 runs??? Quantitative - number Blood glucose is 87 mg/dL??? Quantitative - number Vocabulary Control-Compare results to – normal outcome Constant-stays the same Variables-factor in an experiment that changes Independent variable-manipulated (I change) Dependent variable-what we are measuring Scientific Method Step 1 Identify a problem-the question the experiment should answer Step 2 Gather information-research information about the question Step 3 Make hypothesis-predict what will you think will happen (educated guess) Step 4 Perform experiment-controlled experiment-one variable changes Step 5 Record and analyze data-record observations and data Step 6 Conclusion-summarization of results States 2 things: 1) hypothesis is right or wrong 2) why? data supported Spontaneous Generation Francesco Redi’s experiment-Do flies come from meat? Hypothesis: flies produce maggots Experiment (Procedure)-jars of meat open and jars of meat covered -controlled variables (dependant)-jar, meat, location, temperature, time -manipulated variables (independent)-gauze keeps flies away from the meat -responding variables-whether maggots appear or not Maggots in open jar-flies would lay eggs in the meat No maggots in covered jar-flies couldn’t lay eggs in the meat Needham’s test of Redi-heated gravy then left the bottle open (Anton van Leeuwenhoek-made the first microscope and found tiny objectscalled them animalcules) Needham wanted to see if these animalcules would grow spontaneously in the gravy -Nedham claimed the heat killed any living things in the gravy-but the animalcules came from the gravy Spallanzani’s Test of Redi’s experiment-he thought that Needham did not heat the samples enough, Spallanzani heated 2 bottles of gravy-left one open and sealed the other-the open bottle was teeming with micro-organisms-the sealed bottle remained organism free. He Concluded that the gravy could not produce living things. Pasteur’s test of Spontaneous Generation Boiled broth-with a crooked stem on the bottle-the broth remained organism free for a whole year-then he removed the neck the broth was teeming with organisms Pasteur showed other scientist that living organisms come from other living organisms Pasteur was a great scientist (Pasteurization) This is part of the cell theory that living things come from living things These experiments proved that spontaneous generation is not true Collaboration of Scientists How a Theory Develops (theory or law)??? Theory is a well tested explanation that unifies a broad range of observations; a plausible or scientifically acceptable general principle or body of principles offered to explain phenomena; an unproved assumption NOT A LAW Law is a statement of an order or relation of phenomena that so far as is known is invariable under the given conditions; a general relation proved or assumed to hold between mathematical or logical expressions Examples Law of Gravity-will not change-concrete (states that every point mass in the universe attracts every other point mass with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them) Law of -will not change-concrete (no energy or matter can be created or destroyed)
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