Foretony at 12:21, 28 August 2014

2014-08-28T12:21:53Z

Foretony at 11:33, 28 August 2014

2014-08-28T11:33:39Z

Foretony: Created page with " Forest_PHYS100_Demos"

2014-08-28T11:29:21Z

Created page with " Forest_PHYS100_Demos"

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[[Forest_PHYS100_Demos]]

← Older revision		Revision as of 12:21, 28 August 2014
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	Then graph the average time from each student measured using 10 trials.		Then graph the average time from each student measured using 10 trials.
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		+	Demo I: The Scientific Method
		+	To begin this demonstration I will pass around the medicine ball and the tennis ball so the students can clearly feel the difference in weight. I will then ask them when dropped simultaneously, which ball will hit the ground first. I will call on some students to provide and answer with a reason as to why they believe in their answer (make a hypothesis). We will then proceed to the experiment. I will drop the balls and they will hit the ground at the same time. We will then proceed to the data analysis. I can drop the balls several times so the students can see it wasn’t just a coincidence. We will then analyze the experiment. I can solve the equation of motion for a falling projectile with no initial velocity and show them that there is no mass dependence. Then as a class, we will discuss the results and clear up any questions that may be around.
		+	Calculation for Demo I:
		+	y= v_0 t+ 1/2 gt^2 →t= √(2y/g)
		+	Note there is no mass dependence on the time of flight.
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		+	Demo II: Units and Measurements
		+	To begin this demonstration I will pass around some 5kg masses. I will call on some students to make a guess as to how much the mass weighs in Newtons and in pounds. Then I will demonstrate to the students how to convert mass to Newtons, and then Newtons to pounds.
		+	If we have 5kg,then we have 5×9.8=49N
		+	The conversion from Newtons to pounds is 1N= .224 lbs.So if we have 49N then we will get
		+	49N × .224 lbs/N= 10.98lbs
		+	Now that I have shown the students how to do some basic conversions, I will tell them that I am 6’ 1’’ and ask them what that is in meters and centimeters. I will write that there are .3048 meters per foot and 2.54cm per inch. So if I am 6’1’’, then I am 6 feet x .3048 meters/foot = 1.8288 meters and 2.54 cm tall.
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		+	Demo III: Error and Accuracy
		+	First I will make sure that everyone has some way of finding the time of flight for the dropping tennis ball (cell phone/stopwatch), and then I will drop the tennis ball from one meter once and create a histogram for the times that have appeared. Also I can explain what a histogram is if the students don’t already know. I will then ask the students to compute the average time that it took the tennis ball to fall. I will make comments on the (hopefully) Gaussian distribution of the times and comment on the width. Since we don’t have very many data points, we will get a wide distribution. Then I will tell the students that I will be repeating this 10 times and that they will all get 10 data points and find the average. Those averages will then be put into a histogram and the distribution should sharpen. I will then explain how more data points leads to a better measurement overall. After I have made a histogram I will compute how long the ball should take to fall theoretically and compare that answer to the times that we have measured. I can then ask the students about the precision of their measurements and the accuracy (If you don’t explain the difference then I can). The theoretical time of flight is t = .45 seconds

← Older revision	Revision as of 11:33, 28 August 2014
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	+	=PHYS 100 Week 1 Demos=
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	+	==Scientific method==
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	+	Two ball of differnt mass are dropped.
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	+	Student compose of theory of which one will hit the ground first.
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	+	==Measurement==
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	+	Have the class measure the fall time of an object.
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	+	The instructor graphs their times after one measurement.
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	+	Then graph the average time from each student measured using 10 trials.

Forest PHYS100 Demos Week1 - Revision history

Foretony at 12:21, 28 August 2014

Foretony at 11:33, 28 August 2014

Foretony: Created page with " Forest_PHYS100_Demos"