Physics for the Life Sciences I

1. Physics for the Life Sciences I Fall 2010 Adam T. Whitten PEngl 101

2. Resources • Text – College Physics 8th Ed. w/WebAssign by Serway & Vuille • Course Manual – contains detailed information • My website – same info as manual plus additions (e.g., test solutions) • WebAssign website • Self register using class code and access code • Class codes: Section 03A (11:20) csbsju 1747 6239 Section 04A (1:00) csbsju 5704 3356 • Lab Manual: purchase 2 lab notebooks

3. What is Physics? • Study of laws governing interactions of ______________ • Understanding stated in terms of evolving ______________ • Data either supports or disproves a theory – ____________________

4. Physics 105 Physics 106 What We’ll Study

5. MKS or SI units Units – Système International (SI) Base and derived units listed in Appendix D, p. A.21 Measure: Prefixes:

6. Dimensional Analysis • Using _____ to check for errors in your solution • Using units to help with ___________ manipulation Example:

7. Significant Figures (Digits) • Definition: a reliably known ________ • Mathematical results only have as many significant digits as the operand with the _________ significant digits • Leading zeroes _________ count • Zeroes trailing fractional part after decimal point _________ count • _________ zeroes always count

8. Significant Digits (Examples) How many sig figs are there for each number? A = 600 J ___________ B = 660 cm ___________ C = 60.1 mm ___________ D = 0.3 s ___________ E = 0.03 s ___________ F = 0.00300 s ___________

9. Sig Figs and Addition/Subtraction Sig figs of result determined by operand with _______________________________. 1.25 + 6.2832 + 31.043 = _______ → _______ 0.75 + 5.3728 − 12.269 = _______ → _______ 5200 + 80 + 1.002 = ________ → ______ Watch out for units! 4.5 m − 45 cm + 9 mm = ______________________ = _______ → _______

10. Sig Figs and Multiplication/Division Result has same number of sig figs as operand with the _____________ of sig figs. (650 J)×(0.00300 s) = _______________ (60.1 mm)/(0.00300 s) = ___________________ → ___________________ (660 cm)/(0.03 s) = ____________________ → ____________________ (350 cm)/(0.0013 s) = ____________________ → ___________________ ______________ helps keep track of sig figs!

11. Unit Conversions • Always (95% of the time) convert to ___ units • Prefixes listed in Table 1.4, p. 3 • Conversion factors (inside front cover) • Use fractional forms to ________ units • Watch out for units with ___________

12. Orders of Magnitude • Represented as powers of ten • Examples:

13. Coordinate Systems • Origin, O – fixed ____________ point • Set of specified axes w/ ______________ • Instructions for labeling points relative to __ Cartesian Coordinates Polar Coordinates Fig. 1.4, p. 13 Fig. 1.5, p. 14

14. Trigonometry – Right Triangles • Relates Cartesian and Polar Coordinates • Given any two values x, y, r, θ, the other 2 can be found Fig. 1.6, p. 14

15. Problem Solving Procedure (Outlined in Course Manual and p. 16 of text book) • Read the problem • Draw diagram • Label all physical quantities in diagram • Identify the physical principle(s) or law(s) • Equations relating physical quantities are written down • Solve the set of equations algebraically • Substitute in the known numerical values • Check your answer