Physics 4A, College of the Desert, Chapter 1.txt

Problem solving

[I SEE]I = IdentifyS= Set upE = ExecuteE = Evaluate

Target Variable

The quantity whose value you're trying to find.

Identify

Find out what is relivant, find target variable.

Set Up

The problem: figure out what tools to use (ie:equations), how to use them possably draw a sketch.

Execute

The solution: "do the math". List equations and variables, then solve the variables.

Evaluate

Your answer: does your answer make sence?

Model

A simplified version of a physical system that would be too complicated to analyze in full detail.

Physical Quantity

Any number that is used to describe a physical phenomenon quantitatively.

Operational definition

Defined by how we use them.

1 Kilometer

= 1Km = 103 meters = 103 m

1 Sec

Is the amount of time required for 9,192,631,770 cycles of this microwave radiation.

Meter

The distance that light traveles in a vacume in 1 / 299,792,458 secound.

Nano

10-9

Micro

10-6

Milli

10-3

Centi

10-2

Kilo

103

Powers of 10

Yocto = 10-24 y Zepto = 10-21 z Atto = 10-18 a Femto = 10-15 f Pico. = 10-12 p Nano. = 10-9 n Micro = 10-6 u Milli. = 10-3 m Centi. = 10-2 c Kilo. = 103 k Mega = 106 M Giga. = 109 G Tera. = 1012 T Peta. = 1015 P Exa. = 1018 E Zetta. = 1021 Z Yotta. = 1024 Y

Accuracy

How close it is likely to be to the true value.