u1l2 - scientific knowledge
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Science Fusion PowerNotes - Grade 8 Unit 1 Lesson 2 - Scientific KnowledgeTRANSCRIPT
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Unit 1 Lesson 2 Scientific Knowledge
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Method Acting
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How do scientists choose their methods?• Scientists plan their investigations to address a
specific problem or question.
• Their goal is to come up with a scientific explanation.
• Each problem or question is unique and so requires a unique method and the proper tools.
Unit 1 Lesson 2 Scientific Knowledge
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How do scientists choose their methods?• When choosing their methods, scientists rely on
the tools available.
• Scientists, however, know they don’t always have the tools they need.
• Some tools may be too expensive, and others may not exist.
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Unit 1 Lesson 2 Scientific Knowledge
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How do scientists choose their methods?• Scientists also need to be creative in the ways
they use their tools.
• Tools are useful only if the scientists using them can interpret the data they provide.
• This skill is a large part of the education of a scientist.
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Unit 1 Lesson 2 Scientific Knowledge
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How do scientists choose their methods?• Based on the subject under study, scientists may
plan to do experiments or fieldwork.
• When doing experiments, scientists control different variables under precise conditions in a laboratory.
• Generally, physicists and chemists do a lot of experiments.
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Unit 1 Lesson 2 Scientific Knowledge
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How do scientists choose their methods?• In contrast, scientists doing fieldwork make
observations of what is around them.
• They watch, observe, and try to make sense of what they see.
• Instead of controlling variables, they try to determine what variables are at work and how they relate to each other.
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Unit 1 Lesson 2 Scientific Knowledge
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How do scientists choose their methods?• A large part of doing fieldwork is coming to
understand the variables that exist.
• Biologists and geologists generally do a lot of fieldwork.
• Sometimes, a scientist will do fieldwork and then take a specimen back to a laboratory to do more testing.
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Well, Prove It!
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How do scientific theories become accepted?• Some theories are quickly accepted; others are
not.
• A good scientific theory is one that is supported by most of the evidence and can account for new observations as they arise.
• Such a theory becomes widely accepted.
Unit 1 Lesson 2 Scientific Knowledge
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How do scientific theories become accepted?• At times, as new evidence is discovered, scientists
may find that an earlier theory is incorrect or incomplete.
• Good scientific theories often get modified but are rarely rejected.
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How can you know who’s right?
• The most reliable scientific information is found in professional science journals, but it may not be easy to understand.
• You should be cautious of accepting scientific explanations from advertisers or anyone trying to sell you something.
• When you assess any scientific claim, ask yourself if it makes sense logically and whether the results support it.
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How can you know who’s right?
• Remember that science does not claim to prove anything.
• Science attempts to provide an explanation that agrees with the results of observation and testing.
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A Theory for the Birds
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Dinosaurs take flight
• The fossil Archaeopteryx gave the first solid evidence linking dinosaurs to modern birds.
• Although it had wings and feathers and may have been able to fly, it seems it was more dinosaur than bird.
• It had jaws with teeth, three-fingered claws, and a tail.
Unit 1 Lesson 2 Scientific Knowledge