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PHYS16 – Lecture 2

PHYS16 – Lecture 2. Math Review Friday, September 10, 2010. Agenda. Register clickers Online homework and exam Science math review Before next time. Register clickers. Can you correctly answer A to this question? Yes No. http://kookaburra.com.au. Online homework & exam.

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PHYS16 – Lecture 2

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  1. PHYS16 – Lecture 2 Math Review Friday, September 10, 2010

  2. Agenda • Register clickers • Online homework and exam • Science math review • Before next time

  3. Register clickers • Can you correctly answer A to this question? • Yes • No http://kookaburra.com.au

  4. Online homework & exam • Online Math Exam – Due Sunday at 11:59 pm • Online Homework for next week – Due Tuesday at 11:59 pm • Practice problems…

  5. Science Math Review • Read Ch. 1 in your text • Significant Digits • Scientific Notation • Unit Analysis • Vectors

  6. Math Review – Significant Digits • Digits that actually have meaning! • All digits in a number except for trailing or leading zeros • All digits that relate to the precision of the number • Examples • 1.001 (4 sig figs) • 234 (3 sig figs) • 900 (1 sig fig) • 0.005 (1 sig fig) • 3.4 (2 sig figs) • 45.6 (3 sig figs) • 10 (1 sig fig) • To write 900 and 10 with more sig figs need Sci. Not.

  7. Math Review – Scientific Notation • A way of representing a number so that you can clearly see the significant digits and the order of magnitude • 110 would be 1.1E2 or 1.1x102 • Examples • 1.001 (1.001E0) • 234 (2.34E2) • 900 (9.00E2 or 9.0E2 or 9E2) • 0.005 (5E-3) • 3.4 (3.4E0) • 45.6 (4.56E1) • 10 (1.0E1 or 1E1)

  8. Accuracy vs. Precison • Accuracy = How close measurements are to the target • Precision = Spread in measurements Accurate, not precise Precise, not accurate

  9. Math Review – Unit Analysis • Prefixes • Conversion • 1 mm = ___?___ m • 0.001 m • 1 inch = ___?___ cm • 2.54 cm • Solving Problems • Make sure answer has the correct units

  10. Math Review – Vectors • Ways to write Vectors • 3 mph to the right or 3 mph to the east • 5 mph at 45 degrees from x axis • (3,2) or • Magnitude, Direction, Components

  11. Math Review – Vectors • Adding Vectors • Break into components and add the components • Subtracting Vectors – Add the negative vector

  12. For next time… • Do the Online Math Exam • Get the Connect Access card • Enter the course ID – in syllabus materials • Read Ch. 1 and Ch. 2 • Ch. 1 won’t have any additional homework… • Ch. 2 online homework will be due Tuesday at 11:59 pm • Get course materials and make sure to register!

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