1. WELCOME TO Physics 1401: A1 & A3 Mr. Kris Byboth

2. Syllabus The course syllabus can be found on the web at The course syllabus can be found on the web athttp://www.blinn.edu/brazos/natscience/kbyboth/

3. Keys To Success Don’t get behind Don’t get behind Ask a question every time something is unclear!!! Ask a question every time something is unclear!!! Write a formal solution to every problem (learn how to approach problems) Write a formal solution to every problem (learn how to approach problems) Work more problems (you cannot memorize physics) Work more problems (you cannot memorize physics) Form study groups Form study groups

5. What is Physics? Physics is the study of the laws of nature. 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. 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. This course will emphasize application of mathematical models to physical situations.

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

7. MeasurementVariableSI UnitOther Common Units LengthlMeters (m)ft, in, mi, cm, mm, km Distancedm Positionx, y, rm DisplacementΔx, Δy, Δrm TimetSeconds (s)hr, yr Velocityvm/smi/hr, ft/s Speedsm/s Accelerationam/s 2 MassmKilogram (kg)gram WeightwNewton (N)lb

8. 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

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

10. Conversion factors to know 1ft = 12 in 1ft = 12 in 1in = 2.54cm 1in = 2.54cm 1yd = 3ft 1yd = 3ft 1mi = 5280ft = 1609m 1mi = 5280ft = 1609m 1m = 3.281ft 1m = 3.281ft 1hr = 60min = 3600s 1hr = 60min = 3600s 1m = 100cm = 1000mm 1m = 100cm = 1000mm 1km = 1000m 1km = 1000m

11. Unit Prefixes table 1-4 pg 5 PrefixAbbreviation Conversion PrefixAbbreviation Conversion megaM10 6 megaM10 6 kilok10 3 kilok10 3 centic10 -2 centic10 -2 millim10 -3 millim10 -3 microμ10 -6 microμ10 -6 nanon10 -9 nanon10 -9 picop10 -12 picop10 -12 Read as 1 (Prefix) = Conversion (unit) Read as 1 (Prefix) = Conversion (unit) 1kilometer = 10 3 m = 1000m 1kilometer = 10 3 m = 1000m 1cm = 10 -2 m = 0.01m 1cm = 10 -2 m = 0.01m

12. Conversion Practice 10,000ft = ? mi 10,000ft = ? mi 1.89mi 1.89mi 4.5yd = ? cm 4.5yd = ? cm 411.48cm 411.48cm 45m 2 = ? cm 2 45m 2 = ? cm 2 450000cm 2 450000cm 2 55mi/hr = ? m/s 55mi/hr = ? m/s 24.59m/s 24.59m/s

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