At the start of class Mr. Burk handed us back our reassessments that we had taken. The two reassessments that we got back were one that was about Concepts 2.3, 2.3(again), 2.5.2, 2.3.3, 2.5.2(again). In this reassessment it went over a position vs. time graph and how to read it. Also we had to explain it and write an equation, and tell the instantaneous velocity of the cyclist by using the tangent slope method. The other paper that everyone got back was a paper that was about acceleration vs force graphs and also 1/a vs mass graphs. We had to find out the frictional force and how mass afects the acceleration. 1/a vs mass is proportional which is pretty much the same thing as saying that acceleration is inversely proportional to mass. That being said if Mass doubles then acceleration will do what? It will be cut in half. The last thing we got back was 3C in which we went over forces that included vectors in them and the magnitude of them. Also we had to find out the tension forces of strings with weights hanging from them. Then we had to sketch position vs time graphs, velocity vs time graphs, or acceleration vs times graph; for a certain set of data. After the first five minutes of class we went over 3D in detail and made sure that everyone understood that homework assignment. We briefly went over what our homework was and that it was to have the Inertial Balance Lab done by Friday (which is our next class period) and we had to have four parts to it. The three parts include: amplitude independence of inertial balance, determining the relationship between period and mass, massing a clamp in grams, and understanding a complex system. The amplitude independence of inertial balance we have to write a paragraph to show that we understand how the amplitude did not affect the period of the inertial balance. For determining the relationship between period and mass we have to make a period vs mass graph , find a linearized version of that graph and then write an equation for the linearized graph and include a paragraph along with it, then we must write one paragraph and make a graph theat explains how to find out the mass of a single clamp in grams. For understanding a complex system we must understand that if you add mass to the balance or suspended from it it doesn't change the results. Use this to explain why we draw free body diagrams of complex things as simple dots. Finally, for the last thing that we did during this class period we took notes on some new topics:
How does the tension force of William on Sana
compare to the tension force of Sana on William. (They are equal in size, opposite in direction)
A novice student would say that the stronger person pulls harder, when in fact this is wrong. An observation that we made in class is that when two people pull on each other's spring scales, the force reading is the same. Also, the force acting on person 1's spring scale is done by person 2. And the tension force acting on person 2's spring scale is done by person 1. This class covered some interesting concepts and a really big idea that had previously been discussed that when the Force(net) is = 0, the velocity is constant. Whether it is not moving or just moving at the same speed it was moving. The scribe for Friday... is Burge.
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