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20 Cards in this Set
- Front
- Back
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Scientific Method |
A logical approach to solving problems by observing and collecting data, formulating hypotheses, testing hypotheses, and formulating theories that are supported by data |
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System |
A specific portion of matter in a given region of space that has been selected for study during an experiment or observations |
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Hypothesis |
Testable statement |
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Model |
in science is more than a physical object; it is often an explanation of how phenomena occur and how data or events are related |
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Theory |
is a broad generalization that explains a body of facts or phenomena |
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Quantity |
Something that has magnitude, size, or amount |
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SI |
Seven base units used by scientists |
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Weight |
A measure of the gravitational pull on matter |
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Length |
SI standard unit : meter |
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derived units |
Combinations of SI base units |
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Volume |
The amount of space occupied by an object |
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Density |
the ratio of mass to volume (or mass divided by volume) |
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Dimensional analysis |
A mathematical technique that allows you to use units to solve problems involving measurments |
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Accuracy |
refers to the closeness of measurements to the correct or accepted value of the quantity measured |
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Precision |
refers to the closeness of a set of measurements of the same quantity made in the same way. |
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Percentage error |
is Calculated by subtracting the accepted value from the experimental value, dividing the difference by the accepted value, and then multiplying by 100. |
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Significant figures |
a measurement consists of all the digits known with certainty plus one finial digit, which is somewhat uncertain. |
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Scientific notation |
numbers are written in the form Mx10^n, where M is a number greater or equal to 1 but less than 10 and n is a whole number. |
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directly proportional |
when dividing one quantity by another quantity gives a constant value |
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Inversely proportional |
When the product of two quantities is constant |
