As on all forms, be sure you have your data backed up in another document, and in your lab notebook.

Submitting Assignment: Response to Key Systems Intro _ phy 1

Your course (e.g., Mth 151, Mth 173, Phy 121, Phy 232, etc. ):

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Remember that it is crucial to enter your access code correctly.  As instructed, you need to copy the access code from another document rather than typing it.

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Remember that you should compose your answers in a text editor or a word processor, not in this form, to avoid possible loss of data (for example if your ISP fails or kicks you out, or if your computer malfunctions).  Having composed your response you will copy-and-paste it into the box provided near the end of the form.

You need not answer all the questions in a single session.  You might for example answer half the questions in one session and submit them, then in a separate submission on a different day you may answer the other half.  You could even break the document into 3 or 4, or even more, parts and submit them separately, using this same form each time.

Directions: 

Copy the lines that appear below, starting with the line that reads 'Copy starting here' and ending with the line that reads 'Copy to this point', and paste your copy into a text editor or a word processor.  Don't worry if you happen to copy an extra line or two; that won't cause a problem.

Insert your answer to each question following the words 'Your best answer', in the line below the question.

Be sure to save your copy of your answers.

When you have given your best answers to the questions, copy and paste the contents of your document into indicated box near the end of the form.

Remember that you aren't expected to be an expert on any of these systems.  Just view the clips, give each question your best thinking, and answer.  Try to convey as much information as possible in a reasonable number of words (so that you don't spend an inordinate amount of time typing, and so that you do spend some time thinking about how to say what you have to say; this advice is for your benefit--your instructor has no objection to reading a lot of words).

Copy starting here:

Questions about pendulums:

What do we mean by equilibrium, frequency, amplitude and period of a pendulum?

Your best answer:

 

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Do the period and frequency of a pendulum depend on its length?  If so, how?

Questions about Marble Rolling Down Incline:

Your best answer:

 

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What measurable quantities change when we change the slope of the incline?

Your best answer:

 

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The position at which the marble first contacts the blue piece of foam (on which it ultimately lands) changes with the slope of the incline.  If we continue increasing the slope of the incline, will this position keep changing, and how?  

Your best answer:

 

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Questions about rotating straw:

Through how many degrees do you estimate the straw rotated, and how long did it take to come to rest after the push?  So on the average, through how many degrees per second was it rotating?

Your best answer:

 

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How long did it take to complete its last 180-degree rotation?  Through how many degrees per second was it moving, on the average, during the last 180 degrees?

Your best answer:

 

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Are there measurements you could take to confirm the obvious fact that the system is slowing down?  If so, please describe how you would do this.

Questions about simultaneous pendulum release and dropping of washer:

Your best answer:

 

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Did the pendulum hit the wall before or after the dropped washer hit the table?

Your best answer:

 

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What could you change in order to make the two hit at the same instant?  There are a number of answers to this question; try to think of as many as possible.

Your best answer:

 

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How close in time would the two events have to be before you would be unable to detect the difference?

Your best answer:

 

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Quesitons about stretching the rubber band chain:

What observable quantities indicate increasing tension as the ends of the rubber band chain are gradually puller further and further apart?

Your best answer:

 

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Is there any indication that the rubber band on the right end of the chain is under greater or lesser tension than the rubber band on the left?  Is there any indication that the rubber band in the middle is under greater or lesser tension than either of the ends?  Given the rubber bands and paper clips, how could we investigate these questions?

Questions about water flowing from a tube near the bottom of the graduated cylinder:

Your best answer:

 

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Does the water level in the cylinder decrease at a constant, an increasing or a decreasing rate as time goes on?

Your best answer:

 

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Does the horizontal distance traveled by the falling water stream change at a constant, an increasing or a decreasing rate?

Your best answer:

 

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Does the amount of water exiting the cylinder per second increase or decrease as time goes on?  Does it increase or decrease at an increasing or decreasing rate?

Your best answer:

 

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What could we measure to determine the speed of the water as it exits the cylinder?

Your best answer:

 

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Does the speed of the water exiting the cylinder increase, decrease or remain the same as it falls?

Your best answer:

 

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(Physics II students only):  Does the gravitational potential energy of the system change with time?  If so, how?

Your best answer:

 

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How are the answers to the above questions related?

Your best answer:

 

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Questions about domino stack (only Physics II students are asked to answer these questions, though Physics I students are welcome to do so if they wish)

Does the stack have greater potential energy before being stacked or after, or is the potential energy the same for both?

Your best answer:

 

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Does the stack have greater kinetic energy before being stacked or after, or is the kinetic energy the same for both?

Your best answer:

 

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If we know the mass of a domino and its height relative to the tabletop, how do we find its gravitational potential energy?

Your best answer:

 

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If we know the mass of a domino and its velocity, how to we find its kinetic energy?

Your best answer:

 

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If a domino is removed from the top of the stack and placed on the tabletop, does the potential energy of the system change?  If the entire stack, except for the bottom domino, is moved off the bottom domino and placed on the tabletop, does the potential energy of the system change?  Which final state of the system has the greater potential energy?

Your best answer:

 

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Questions about box and beads:

The box shakes back and forth from left to right.  The box is inclined so that the end away from the camera is higher than the end closer to the camera.  So how is it that some of the beads manage to 'climb' toward the 'high' end?

Your best answer:

 

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What do you think is the average ratio of the number of beads in the 'upper half' of the box to the number in the 'lower half'?

Your best answer:

 

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There are 4 large beads, 4 small beads and 7 medium-sized beads in the box (call this a 4-4-7 proportion).  What percent of the beads in the box are of each size?  Do you think the beads that make it to the 'upper half' are in the same proportion?  How could you obtain data to measure this?

Your best answer:

 

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Pulse propagating down rubber band chain:

If you look at the video frame-by-frame you can probably see the pulse as it propagates down the chain.  It becomes harder to see as it reflects back toward the far end, and becomes almost completely obscured before it starts its second trip toward the camera.  It's worth trying to trace the pulse.

Your best answer:

 

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The pulsing motion is gradually replaced by a simple back-and-forth motion of the chain.  Why do you think this occurs?

Your best answer:

 

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Back-and-forth motion of rubber band chain:

The frequency of the back-and-forth motion of the chain decreases when the chain gets shorter and increases when the chain gets longer.  Why do you think this happens?

Your best answer:

 

#$&*

Copy to this point.

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