Please note the expected schedule for the next couple of days. We need to finish the current unit. I would like you to start review for the chapter test next week- the test date has been postponed several times, but we have to accomplish it and move on.
I will be attending the NJSTA science convention on Tuesday and Wendsday- I will NOT be in school, but I expect that you will be able to take the test regardles. The unit outlines on my website, as are the objectives, which are what I will expect you to know. You will have assignments to help you review.
I would like to begin posting questions you have about the material for this upcomming test HERE as comments for this post, and I will answer them for you.
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mr. todd
ReplyDeletei would like to know the names of the different lines becasue i have no idea what they are i also have a question about finding slop formula
Please reread the graphical analysis and experimental design article that is available at the Honors Physics Download page
ReplyDelete1.No relationship- Flat line, slope = 0, y=b
2. Linear relationship-- a regular line graph. If it passes through the origin it is considered a direct proportion.
3. Parabolic-- x squared relationship-- opens either vertically; y squared relationship opens horizontally
4. Hyperbolic-- mirror image of parabola, 1/x relationship- inverse relationship
Point slope formula-- find two sets of coordinates on your line (x1,y1) and (x2,y2) then use the following formula to determine slope: (y2-y1)/(x2-x1)
From a question I received today:
ReplyDeleteA hypothesis is an unproven statement as to a way the world work that has specific observational predictions associated with it
A Law/Principle is a hypothesis whose predictions have been tested many times by competant observers and which has not been disproven. A "FACT". for example the law of conservation of energy- energy is neither created nor destroyed in the universe,only recycled- has never been invalidated by experiment or observation(especially astronomical observations of past periods in the universe. Or newtons law of gravity that relates mathematically how the masses of two objects and their distance determines the gravitational attraction between them.
A THEORY is a more comprehensive synthesizing model that connects many different and possibly disparate phenomenom, observations, hypothesis, and laws into a larger, fundamental model. A theory makes predictions about future novel observations- the more these predictions are supported by evidence,the more it correctly predicts expected results for observations,the more it easily encompasses new hypothesis and newly discovered principles,then the more powerful the theory- and therefore the closer to truth it lies.
Example- The Atomic Theory of Matter explains- phase changes, chemical reactions,stochiometry, the gas laws, Le Chatliers Rule, heat conduction, Brownian motion, thermal energy, ect...
So "fact" is really a sliding scale continium that is dependent on the amount of evidence suporting any given "factual statement", and how useful it proves in explaining new observations. The more evidence for an idea,then the more confidence we have that it is some very close approximation of the truth.
In we place them in a tentative heirachry based on strength of evidence
Working Hypothesis- possible fact, not yet supported by evidence
"Facts":
---------------------
Hypothesis supported by evidence
v
Hypothesis suported by lots of evidence
v
Law/Principle
Theory > Principles 1,2,3,4 + Hypothesis 1,2,3
Websites on this stuff
ReplyDeletehttp://teacher.pas.rochester.edu/phy_labs/appendixe/appendixe.html
http://physics.ucr.edu/~wudka/Physics7/Notes_www/node5.html#SECTION02120000000000000000