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PH 144

Pre Health Physics I. PH 144. Welcome!. About Me. Matthew Kaskiw, H.BSc , M.Sc Organic chemistry major CanFit Pro certified personal trainer Music producer Anticancer research Two published journal articles. About Me. General Notes. Evaluation Success Tutorial Help. Contact Info.

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PH 144

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  1. Pre Health Physics I PH 144 Welcome!

  2. About Me • Matthew Kaskiw, H.BSc, M.Sc • Organic chemistry major • CanFit Pro certified personal trainer • Music producer • Anticancer research • Two published journal articles

  3. About Me

  4. General Notes • Evaluation • Success • Tutorial • Help

  5. Contact Info • Email: matthew.kaskiw@confederationc.on.ca • Email: mattkaskiw@gmail.com • Telephone: 807-355-9977

  6. Course Syllabus

  7. What is Physics? • Physics is “the study of matter, energy, and the interaction between them” • It’s everywhere! • Development of sustainable forms of energy • Atmosphere/air • Design and manufacture of sports equipment • Music/how we hear sound • Human body

  8. What is Physics? • Medical Applications • Biomedical Physics • Astrophysics • Big Bang Theory

  9. What is Physics? • Multiple Dimensions • String Theory

  10. Hierarchy of Sciences

  11. Hierarchy of Sciences Standard My modified list

  12. SI Units • SI = International System of Units • Length, mass, time are fundamental physical quantities and are SI base units • Mechanics (motion and force) only use these • Length = meter (m) • Mass = kilogram (kg) • Time = second (s)

  13. Metric System Multiples, Prefixes and Abbreviations

  14. Volume • SI unit of volume is the cubic meter (m3) • Or litre (L) • 1L = 1000cm3 (10cm x 10cm x 10cm) • 1L = 1000mL • 1mL = 1cm3 = 1cc • 1L of water has mass of 1kg • so 1mL of water has a mass of 1g

  15. Unit Analysis • The two sides of an equation must be equal in numerical value and also in units • ex. 2m x 4m = 8m2 • when solving problems always use the same system of units and the same unit for a given dimension • ex. 8 mi + 7km. One must be converted.

  16. Unit Conversion • to change units, conversion factors are used • equivalence expressed in ratios • ex. 1kg = 2.2lb • so

  17. Significant Digits • ex. 0.0000047s has two sig figs (think scientific notation, 4.7 x 106). The zeros are not significant. Get used to scientific notation if not familiar • ex. 74837.32m has 7 sig figs • ex. 74837.00m has 7 sig figs (think about when you measure something). The zeros after the decimal are significant.

  18. Significant Digits • in multiplying and dividing calculations, leave as many sig figs in the answer as there are in the quantity with the least sig figs • keep rounding in mind • ex. • ex. (523 x 106m)x(0.4650 x 102m) = 2.43 x 1010 m2

  19. Significant Digits • For addition and subtraction calculations, leave as many sig figs in the answer as the number with the least amount after the decimal • Ex. 24342.2 + 0.2345 = 24342.4 • Ex. 245 – 6.6 = 238

  20. Problem Solving • the most important slide in this class

  21. Problem Solving • Step 1 Read and Analyze • what exactly does the question want answered • write it down (ex. mass = ?) • what is given • what is needed to answer

  22. Problem Solving • Step 2 Draw a picture • ex. Tiger Woods hammers a tee shot at the US Open. What is the max height of his shot?

  23. Problem Solving • Step 3 Write down all data and convert • ex. A Maserati Quattroporte races a Bugatti Veyron starting at the stop light. The Maserati accelerates at a constant 2.5m/s2 for half a minute. What is the Maserati’s velocity at half a minute? • vo = 0 (at rest) a = 2.5m/s2 t = 30s (converted from 0.5min) v1 = ?

  24. Problem Solving • Step 4 Determine which equations apply • ex. A Maserati Quattroporte races a Bugatti Veyron starting at the stop light. The Maserati accelerates at a constant 2.5m/s2 for half a minute. What is the Maserati’s velocity at half a minute? • v1 = v0 + at

  25. Problem Solving • Step 5 Sub in quantities/data into equations and perform calculations • ex. A Maserati Quattroporte races a Bugatti Veyron starting at the stop light. The Maserati accelerates at a constant 2.5m/s2 for half a minute. What is the Maserati’s velocity at half a minute? • v1 = v0 + at • v1 = 0 + (2.5m/s2)(30s) • v1 = 75m/s

  26. Problem Solving • Step 6 Does the answer make sense • ex. A Maserati Quattroporte races a Bugatti Veyron starting at the stop light. The Maserati accelerates at a constant 3.5m/s2 for half a minute. What is the Maserati’s velocity at half a minute? • v1 = 75m/s • does the answer have the correct magnitude? • is the direction correct? • reasonable? v1 = 75m/s = 270km/h = 168mi/h

  27. Homework. yay • Textbook Chapter 1 • Learning Path Questions • Pg. 26: 5, 8, 9 • Pg. 27: 14, 15, 16, 17 • Exercises • Pg. 28: 5, 7, 11 • Pg. 29: 23, 29, 33 • Pg. 30: 41, 43, 51 • Pg. 31: 57a, 65

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