WELCOME TOWELCOME TOPhysics 1401:Physics 1401:

A1 & A3A1 & A3

Mr. Kris BybothMr. Kris Byboth

SyllabusSyllabus

The course syllabus can be found on the The course syllabus can be found on the web atweb at

http://www.blinn.edu/brazos/natscience/http://www.blinn.edu/brazos/natscience/kbyboth/kbyboth/

Keys To Success Keys To Success

Don’t get behindDon’t get behind Ask a question Ask a question everyevery time something time something

is unclear!!!is unclear!!! Write a formal solution to every Write a formal solution to every

problem problem (learn how to approach problems)(learn how to approach problems)

Work more problems Work more problems (you cannot memorize physics)(you cannot memorize physics)

Form study groupsForm study groups

What is Physics?What is Physics?

Physics is the study of the laws of Physics is the study of the laws of nature.nature.

It is the attempt to understand, It is the attempt to understand, model, and predict the behavior of model, and predict the behavior of the world around us.the world around us.

This course will emphasize This course will emphasize application of mathematical models application of mathematical models to physical situations.to physical situations.

UnitsUnits

Each measurement requires some Each measurement requires some predefined unit of measure. predefined unit of measure. Units will often help you identify what Units will often help you identify what

variables are being given in a problem.variables are being given in a problem.

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 Δx, Δy, Δr 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

SI UnitsSI Units

LengthLengthmeter (m)meter (m) – The distance traveled by light in – The distance traveled by light in vacuum in 1/299,792,458 secondsvacuum in 1/299,792,458 seconds

MassMasskilogram (kg)kilogram (kg) – The mass of a specific platinum- – The mass of a specific platinum-iridium cylinderiridium cylinder

TimeTimesecond (s)second (s) – The period of 9,192,631,770 – The period of 9,192,631,770 oscillations the radiation from a cesium-133 atomoscillations the radiation from a cesium-133 atom

ConversionsConversions

Converting between units is just multiplying Converting between units is just multiplying by one.by one.

7.4ft = ?in7.4ft = ?in The conversion factor is 1ft = 12 in The conversion factor is 1ft = 12 in

inft

inft

ft

in

8.881

12*4.7

1

121

Conversion factors to knowConversion factors to know 1ft = 12 in1ft = 12 in 1in = 2.54cm1in = 2.54cm 1yd = 3ft1yd = 3ft 1mi = 5280ft = 1609m1mi = 5280ft = 1609m 1m = 3.281ft1m = 3.281ft 1hr = 60min = 3600s1hr = 60min = 3600s 1m = 100cm = 1000mm1m = 100cm = 1000mm 1km = 1000m1km = 1000m

Unit Prefixes Unit Prefixes table 1-4 pg 5table 1-4 pg 5

PrefixPrefix AbbreviationAbbreviation Conversion Conversion megamega MM 101066

kilokilo kk 101033

centicenti cc 1010-2-2

millimilli mm 1010-3-3

micromicro μμ 1010-6-6

nanonano nn 1010-9-9

picopico pp 1010-12-12

Read as 1 (Prefix) = Conversion (unit)Read as 1 (Prefix) = Conversion (unit) 1kilometer = 101kilometer = 1033 m = 1000m m = 1000m 1cm = 101cm = 10-2-2 m = 0.01m m = 0.01m

Conversion PracticeConversion Practice 10,000ft = ? mi10,000ft = ? mi

1.89mi1.89mi 4.5yd = ? cm4.5yd = ? cm

411.48cm411.48cm 45m45m2 2 = ? cm= ? cm22

450000cm450000cm22

55mi/hr = ? m/s55mi/hr = ? m/s 24.59m/s24.59m/s

Round Off ErrorsRound Off Errors

Round off errors are deviations of a Round off errors are deviations of a solution (usually but not always solution (usually but not always small) from the actual solution due to small) from the actual solution due to rounding intermediate calculations in rounding intermediate calculations in route to the final solution.route to the final solution.

If possible reduce all problems to an If possible reduce all problems to an algebraic solution then calculate a algebraic solution then calculate a numeric answer. numeric answer.