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 Physics - Ms. Kohler

 Physics - Ms. Kohler. Warm up: How many mL is 2.34 X10 -12 L?. Date: 7/31/2018 Unit 0: Inquiry Learning Goal:  Determine an appropriate method for data collection and reporting. Yes , you DO have a reflection today.  Physics - Ms. Kohler. Significant Figures.

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 Physics - Ms. Kohler

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  1.  Physics - Ms. Kohler Warm up: How many mL is 2.34X10-12 L? Date: 7/31/2018 Unit 0: Inquiry Learning Goal: Determine an appropriate method for data collection and reporting. Yes, you DO have a reflection today.

  2.  Physics - Ms. Kohler Significant Figures Significant figures are each of the digits of a number that are used to express it to the required degree of accuracy, starting from the first non-zero digit. In the number 541 we have three significant figures, the same as if it were written 0541, because we begin with the first non-zero digit. The same applies when using decimals. In the number 0.067 there are 2 significant figures. But the number 0.0670 has 3 significant figures, because we do count zeros that come after the first non-zero digit. Date: 7/31/2018 Unit 0: Inquiry Learning Goal: Determine an appropriate method for data collection and reporting.

  3.  Physics - Ms. Kohler Significant Figures A value or calculation is only as accurate as it’s least accurate measurement. For example:When calculating the density of an object, you find that it has a mass of 140.55g and a volume of 22cm3. The mass measurement contains 5 significant figures but the volume measurement only contains 2 significant figures. This means our calculation for density can only contain 2 significant figures: 0.21g/cm3. Date: 7/31/2018 Unit 0: Inquiry Learning Goal: Determine an appropriate method for data collection and reporting.

  4.  Physics - Ms. Kohler Significant Figures - Whiteboard Practice With the person sitting next to you, find the number of significant figures in each of the questions on the board. Write them on your whiteboard and hold it up when you’re done. Date: 7/31/2018 Unit 0: Inquiry Learning Goal: Determine an appropriate method for data collection and reporting.

  5.  Physics - Ms. Kohler Demonstrations of Knowledge Model: A representation of something difficult or impossible to display directly. Theory: An explanation for patterns in nature that is supported by scientific evidence and verified multiple times by various groups of researchers. Law:  A concise description, usually in the form of a mathematical equation, used to describe a pattern in nature. Date: 7/31/2018 Unit 0: Inquiry Learning Goal: Determine an appropriate method for data collection and reporting.

  6.  Physics - Ms. Kohler Accuracy vs. Precision The words “accuracy” and “precision” have specific meanings in science. Accuracy: for a single measurement, how close the measurement is to the “correct” or accepted value. For a group of measurements, how close the average is to the accepted value. Precision: for a single measurement, how finely the measurement was made. (How many decimal places it was measured to.) For a group of measurements, how close the measurements are to each other. Date: 7/31/2018 Unit 0: Inquiry Learning Goal: Determine an appropriate method for data collection and reporting.

  7.  Physics - Ms. Kohler Yes, you DO have a reflection today. Warm up: How many significant figures are in the measurement 2.34X10-12 L? Date: 7/31/2018 Unit 0: Inquiry Learning Goal: Determine an appropriate method for data collection and reporting.

  8.  Physics - Ms. Kohler Accuracy vs. Precision The first set is both accurate (the average is close to the center) and precise (the data points are all close to each other.) The second set is precise (close to each other), but not accurate (the average is not close to the correct value). This is an example of systemic error—some problem with the experiment caused all of the measurements to be off in the same direction. The third set is accurate (the average is close to the correct value), but not precise (the data points are not close to each other). This is an example of random error—the measurements are not biased in any particular direction, but there is a lot of scatter. The fourth set is neither accurate nor precise, which means that there are significant random and systematic errors present. Date: 7/31/2018 Unit 0: Inquiry Learning Goal: Determine an appropriate method for data collection and reporting.

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