I will be adding captions as I get time. . .


PhyFl18SS1.5.1 Cantina opened this week!


PhyFl18SS1.5.2 Here is a unit analysis you all did on the board. It turns out it takes light 1.28 seconds to reflect off the moon and hit the earth.


PhyFl18SS1.5.3 I paid off 1st hour 3 dozen donuts to keep me out of the limelight. I was worth it.


PhyFl18SS1.5.4 Here is the sample problem from 1.6


PhyFl18SS1.5.5 Newton’s is a suitcase. Meaning that it is combo unit that contains smaller units. Many times, you have to open these suitcases when you are doing unit analysis. Other examples of suitcases are Joules (kg.m.m / s. s) and Watts (kg . m . m / s . s. s) but we’ll worry about those later this year.


PhyFl18SS1.5.6 You can’t have double decker fractional units in Unit Analysis. units can be multiplied inside a cell, but they can’t divided inside a cell. I will explain this better in class.


PhyFl18SS1.5.7 Free Body Diagrams (FBDs) are used to show all the force vectors acting on an object. Here was the example we did in class of a car driving down a horizontal highway at a constant speed of 60mph.


PhyFl18SS1.5.8 On 1.6.3 the object was a volleyball moving through the air. So in that case there are only two main forces acting on the ball. The force of gravity and the air drag (Ra)


PhyFl18SS1.5.9 Here is most of the GSUA for 1.6.3 I ran out of room here, but you can see the whole thing on the Key to 1.6 on the Facebook Group.


PhyFl18SS1.5.10 In general here is what GSUA looks like. You do your labeled drawing, determine the correct equation and isolate the desired variable in the top row, then you are ready to lay out your givens (just as they are written in the problem. After you do that, you draw the squiggly line, then all that is left to do is multiply by a bunch of conversions which are really just clever forms of 1.


PhyFl18SS1.5.11 The famous pesky fly problem.


PhyFl18SS1.5.12 heres how one student solved it


PhyFl18SS1.5.1 Here is a clever solution involving a graph. I actually used this method to quickly solve the problem on the THT1A.


PhyFl18SS1.5.1 Another students work in solving the Pesky Fly. (1.7.2)


PhyFl18SS1.5.1 Here is the complicated drawing from 1.7.3 I just noticed that I never took a pic of the position vs. time graphs on the other board, but that is okay, because I have the key posted on the Facebook Group.


PhyFl18SS1.5.1 Remember, in better way to write, you are trying to substitute the given unit for a unit that will eliminate as much of the scientific notation as possible. It’s why I don’t say that it is 442,000 inches to the Warren Theater. That is true, but there is a Better Unit to use (miles in this case)


PhyFl18SS1.5.13 BWTW example


PhyFl18SS1.5.14 BWTW example


PhyFl18SS1.5.15 Sam Nobel Museum where the Astronomy talks are held.


PhyFl18SS1.5.16 This actually doubled the record of students voluntarily attending an Astronomy lecture.


PhyFl18SS1.5.17 even more students!


PhyFl18SS1.5.18 my sloppy notes from the talk on Galaxy formation


PhyFl18SS1.5.19 Well, there are at least 3 out of 4 Alberts at the Astronomy Talk.


PhyFl18SS1.5.20 Circular motion will end up being Black Kinematics


PhyFl18SS1.5.21 Pi is the ratio of the circumference of a circle to the diameter of the circle


PhyFl18SS1.5.22 Doesn’t matter how big the circle is, The ratio is ALWAYS pi (3.14 . . )


PhyFl18SS1.5.23 Us doing a pinwheel out in the hallway.


PhyFl18SS1.5.24 We started talking about baby omega.


PhyFl18SS1.5.25 We ended up doing a quick UA getting radians per secon into Revolutions per minute (rpm).
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