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12 Cards in this Set
- Front
- Back
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What did Galileo find in his reexamination?
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Galileo found that for an object to be in motion was just as natural for it to be a rest.
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Theories
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invention or creation of ideas
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Testing
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Science requires testing to prove or understand a theroy, as well as to develop a model.
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When is a new theroy usually accepted?
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In most cases only if it explains a greater range of phenomena than does a previous theroy
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Models
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an analogy or mental image of the phenomena in terms of something else we are already familiar with. an approximate mental or visual picture.
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Theroies Vs. Models
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a model is relatively simple and provides a structural similarity to the phenomena being studied. A theory is broader, more detailed, and can give quantitatively testable predictions, often with great precision.
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Laws
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concise but general statements about how nature behaves, sometimes the statement takes the form of an equation.
Such as Newtons Second Law F=ma |
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principles
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general statements that help prove a law expliermentally vald
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Uncertainty
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every measurement has an uncertainty, there is no precise measurement only approximate
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percent uncertainty
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the ratio of the uncertainty to the measured value, multiplied by 100
8.8 measurement .01 uncertainty .01/8.8*100%=1% |
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Assumed uncertainty
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generally uncertainty is not explicitly stated. In such cases the uncertainty is assumed to be one or a few units in the last digit specified
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Significant Figures
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number of reliably known digits in a number.
EX 23.21 has 4 significant digits 0.062 has 2 significant digits |
