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Today we take some notes, get some loose leaf paper and a pen NOW.

Today we take some notes, get some loose leaf paper and a pen NOW. Everything in BLACK you must copy. Objective: Discovering ERROR and PERCENT ERROR in measuring. When ever we measure in science we try our best to make sure our measures are ACCURATE

kevyn-matthews
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Today we take some notes, get some loose leaf paper and a pen NOW.

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  1. Today we take some notes, get some loose leaf paper and a pen NOW. Everything in BLACK you must copy. Objective: Discovering ERROR and PERCENT ERROR in measuring

  2. When ever we measure in science we try our best to make sure our measures are ACCURATE Accurate = measures that are as close as possible to the correct values Measures that are NOT perfect (and few are), have measurement ERROR. Keep Smiling… JJJJJJJ

  3. I want you to guess how much I weigh (as if you worked in a carnival side show) Write that number down on your notes now. Your measurement is the measured value. A MEASURED VALUE is your best measurement of something. The REAL value, the correct value of measurement, is called the ACTUAL VALUE

  4. According to this official school scale, my REAL weight is ACTUAL VALUE teacher’s weight = POUNDS The ERROR in measuring is determined this way: The difference between the measured and actual measures = measurement error Calculate your measurement error now. SHOW WORK:

  5. Error is ALWAYS a positive number. There is no such thing as NEGATIVE POUNDS, or if you measure anything else (mass, volume, temperature, etc.) no such thing as negative any-things.

  6. You measure a piece of metal to have 1231.5 grams mass, but the actual measure of mass is 1280.6 grams, what is your measurement error? (show work now – what are those lines?) Error = |measured value – actual value| Error =

  7. Do these four problems now: write out the chart quickly

  8. In science, a more important way to measure error is called PERCENT ERROR This measures not just your “mistake”, but makes it a proportion and tells if your measure is UNDER or OVER the actual value. Let’s go back to your measuring my weight. You were off by a certain number of pounds, but let’s figure out exactly your Percent Error now. Measured Value – Actual ValueActual Value X 100% Percent Error =

  9. This formula will be shortened to: MV – AV AV % E = X 100% MV = measured value AV = actual value Calculate your percent error in measuring my weight now.

  10. Out back we have thermometers in ICE WATER and in BOILING WATER. The ACTUAL freezing point for water is 0°C while the ACTUAL boiling point for water is 100°C. What is the error and percent error for each measure? Show your work! Write formulas FREEZING MV = °C AV = 0°C ERROR = % ERROR = BOILING MV = °C AV = 0°C ERROR = % ERROR =

  11. Last slide, last of today’s notes… When the percent error is a negative number, your measuring was UNDER the actual value. When the percent error is a positive number, your measuring was OVER the actual value. QUIZ WEDNESDAY, last day to hand in any back work for report card grades.

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