WELCOME TO Physics 1401: A1

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WELCOME TOPhysics 1401A1 A3

• Mr. Kris Byboth

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Syllabus

• The course syllabus can be found on the web at
• http//www.blinn.edu/brazos/natscience/kbyboth/

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Keys To Success

• Dont get behind
• Ask a question every time something is unclear!!!
• Write a formal solution to every problem (learn
  how to approach problems)
• Work more problems (you cannot memorize physics)
• Form study groups

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What is Physics?

• Physics is the study of the laws of nature.
• It is the attempt to understand, model, and
  predict the behavior of the world around us.
• This course will emphasize application of
  mathematical models to physical situations.

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Units

• Each measurement requires some predefined unit of
  measure.
• Units will often help you identify what variables
  are being given in a problem.

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Measurement Variable SI Unit Other Common Units
Length l Meters (m) ft, in, mi, cm, mm, km
Distance d m
Position x, y, r m
Displacement ?x, ?y, ?r m
Time t Seconds (s) hr, yr
Velocity v m/s mi/hr, ft/s
Speed s m/s
Acceleration a m/s2
Mass m Kilogram (kg) gram
Weight w Newton (N) lb
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SI Units

• Length
• meter (m) The distance traveled by light in
  vacuum in 1/299,792,458 seconds
• Mass
• kilogram (kg) The mass of a specific
  platinum-iridium cylinder
• Time
• second (s) The period of 9,192,631,770
  oscillations the radiation from a cesium-133 atom

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Conversions

• Converting between units is just multiplying by
  one.
• 7.4ft ?in
• The conversion factor is 1ft 12 in

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Conversion factors to know

• 1ft 12 in
• 1in 2.54cm
• 1yd 3ft
• 1mi 5280ft 1609m
• 1m 3.281ft
• 1hr 60min 3600s
• 1m 100cm 1000mm
• 1km 1000m

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Unit Prefixes table 1-4 pg 5

• Prefix Abbreviation Conversion
• mega M 106
• kilo k 103
• centi c 10-2
• milli m 10-3
• micro µ 10-6
• nano n 10-9
• pico p 10-12
• Read as 1 (Prefix) Conversion (unit)
• 1kilometer 103 m 1000m
• 1cm 10-2 m 0.01m

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Conversion Practice

• 10,000ft ? mi
• 1.89mi
• 4.5yd ? cm
• 411.48cm
• 45m2 ? cm2
• 450000cm2
• 55mi/hr ? m/s
• 24.59m/s

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Round Off Errors

• Round off errors are deviations of a solution
  (usually but not always small) from the actual
  solution due to rounding intermediate
  calculations in route to the final solution.
• If possible reduce all problems to an algebraic
  solution then calculate a numeric answer.