PDF-Significant Figures

PacificAtlantic Method6365846688GeneraltutoringeastcentraleduClick to advance slidesIn wordsRule 1 All nonzero digits are significantRule 2 Zeros in front of a number are notsignificantRule 3 Z. What’s the Diff?. Accuracy. Accuracy: . How . closely a measurement matches true or actual values. To . be accurate only requires the true value (the . bulls eye. ) and one measurement (one arrow to hit . What are Significant Figures?. They are all the numbers in a measurement that are known with . certainty. plus the first digit that is uncertain.. Why use Significant Figures?. Significant figures are needed in science, because the tools we use to measure are not infinitely accurate. Physical Science. What is a significant figure?. There are 2 kinds of numbers:. Exact: the amount of money in your account. Known with certainty.. What is a significant figure?. Approximate: weight, height—anything MEASURED. No measurement is perfect.. 2.3. A. What are Significant Figures?. The number of all certain digits in a measurement plus one estimated digit.. Example. 2.0 cm. 1. 0. 2. 3. 4. cm. 2 Significant figures. Examples. 1. 0. 2. 3. 4. &. Scientific Notation. Significant Figures. Scientist use significant figures to determine how precise a measurement is. Significant digits in a measurement include all of the known digits plus one estimated digit. Using Significant Figures. S8CS3: . Students will have the computation and estimation skills necessary for analyzing data and following scientific explanations.. S8CS3d:.  Decide what degree of precision is adequate, and round off appropriately.. Scientific Measurements. SI Units. Significant Figures. SI Units. Measurement system universal to scientists.. Measurement standards (. base vs. derived. ). Base unit—. Quantity we can MEASURE. Derived unit--. Measuring with Precision. Defn: Those numbers that result from directly measuring an object. It shows the precision of the measurement.. Units must be included (no units no sd). The precision of the measurement depends upon the measuring instrument. We make. . QUALITATIVE. . observations of reactions — changes in color and physical state.. We also make. . QUANTITATIVE MEASUREMENTS. , which involve . numbers. .. Use. . SI units . — based on the metric system. The derailment on October 22, 1895 of the Granville-Paris Express that overran the buffer stop. The engine careened across almost 100 feet (30 meters) of the station concourse, crashed through a two-foot thick wall, shot across a terrace and sailed out of the station, plummeting onto the Place de Rennes 30 feet (10 meters) below where it stood on its nose. While all of the passengers on board the train survived, one woman on the street below was killed . Cartoon courtesy of . Lab-initio.com. Uncertainty in Measurement. . A digit that must be . estimated. . is called . uncertain. . A. . measurement. . always has some degree of uncertainty.. Why Is there Uncertainty?. …Matter is anything that occupies space.. The Six Levels . of Thought. Knowledge. Comprehension. Application. Analysis. Synthesis. Evaluation. “Success is a journey, not a destination.”. -Ben Sweetland. In physics we will be taking measurements and using a lot of numbers for calculations. However, we have to be aware of significant figures (sig figs) because every measurement has a certain degree of . Length is measured by observing the marked lines at . the end . of a ruler. The last digit in your measurement is an . estimate, obtained by . visually dividing the space between the marked lines.. Learning Goal .