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Science of Physics

Science of Physics. Metric Prefixes. *. *. *. *. SI Units. Rules for Significant Figures. Rules for Calculating with Significant Figures. Determining Individual and Overall Percent Error. Error is identified as +/- hal f the smallest increment of measurement per device.

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Science of Physics

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  1. Science of Physics

  2. Metric Prefixes * * * *

  3. SI Units

  4. Rules for Significant Figures

  5. Rules for Calculating with Significant Figures

  6. Determining Individual and Overall Percent Error • Error is identified as +/- half the smallest increment of measurement per device. • In the image above the smallest increment of the ruler is 0.1 cm. Therefore the error when measuring would be +/- 0.05 cm. • Hence, the diameter of the block would be 0.55 cm +/- 0.05 cm.

  7. Carrying Error throughout the Calculations • When multiplying or dividing: • Convert all +/- errors into a % error. • Add % errors together. • Convert total % error back to +/- error for the final calculation.

  8. Density Cube Example Equations Recorded Data • Volume = side x side x side • Density = Mass • Volume • Side Length = 2.50 cm +/- 0.05 cm • Mass = 17.10 g +/- 0.05 g Percent Error for Each Measurement 0.05x 100 = 0.29% 17.10 0.05 x 100 = 2.0% 2.50 Calculate out Answer D = Mass = 17.10 g = 1.0944 g/cm3 Volume (2.50 cm)(2.50 cm)(2.50 cm) Add Percent Errors 0.29% + 2.0% + 2.0% + 2.0% = 6.29% Final Answer 1.09 g/cm3 +/- 6.29% or 1.09 g/cm3 +/- 0.07 g/cm3

  9. Double Checking Answers • Dimensional Analysis – utilize the units to determine if your answer makes sense. If the answer is asking for the amount of time required to run a race, the final unit should be in seconds, minutes, hours, etc. • Order of Magnitude – Does the answer make any sense?

  10. Energy Order of Magnitude

  11. Links for Order of Magnitude • http://www.flixxy.com/science-education-universe-documentary.htm • http://primaxstudio.com/stuff/scale_of_universe/ • http://www.youtube.com/watch?v=qysS9xThKXc

  12. Sources • http://www.scienceteacherprogram.org/physics/Image3.gif • http://www.spiraxsarco.com/images/resources/steam-engineering-tutorials/2/1/table_2_1_1.gif • http://whs.wsd.wednet.edu/Faculty/Busse/MathHomePage/busseclasses/physics/studyguides/chapter1/Significant-Digits.jpg • http://whs.wsd.wednet.edu/Faculty/Busse/MathHomePage/busseclasses/physics/studyguides/chapter1/adding-significant.jpg • http://www.chs.k12.nf.ca/science/s1206/physics/sigfigcalc.gif • http://talklikeaphysicist.com/wp-content/uploads/2009/01/energy-scale-100-orders-of-magnitude.jpg • http://www.beginnerphysics.net/images/Fig.1.29.gif

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