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course Phy 201
Copy starting here:
Questions about pendulums:
What do we mean by equilibrium, frequency, amplitude and period of a pendulum?
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Equilibrium would be when the pendulum is at its resting point or straight down.
Frequency is the number times the pendulum completes a cycle forward and back in a given amount of time.
Amplitude is the distance from the starting point to the position that the pendulum will start its swing.
A period is the time required to complete an over and back cycle
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Do the period and frequency of a pendulum depend on its length? If so, how?
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Yes the period and frequency depend on its length. The shorter the string the greater the period and the lesser the frequency.
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Questions about Marble Rolling Down Incline:
What measurable quantities change when we change the slope of the incline?
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The speed at which the marble travels and the distance the marble travels after leaving the inclined surface.
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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?
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Yes the position will continue to change and will increase as the slope increases until it reaches a certain angle and then the location of the landing will start to decrease.
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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?
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It rotated roughly 400 degrees and took about 8 sec. So on average it took about 50 degrees per second.
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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?
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It takes about 5 secs for the last 180-degrees. On average it rotated about 36-degrees per sec.
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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:
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Did the pendulum hit the wall before or after the dropped washer hit the table?
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The pendulum hit the wall first.
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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.
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The time that you release on compared to the other.
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How close in time would the two events have to be before you would be unable to detect the difference?
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That would depend on the ability of how good an average human being can see and hear right?
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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?
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The ends of the rubber bands seem to be slightly longer than those closer to the middle.
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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:
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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?
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The fluid decreases at a constant rate.
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Does the horizontal distance traveled by the falling water stream change at a constant, an increasing or a decreasing rate?
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To me the horizontal distance seems to traveling at a constant rate.
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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?
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It decreases as time goes on.
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What could we measure to determine the speed of the water as it exits the cylinder?
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The distance of the horizontal stream of water vs. the time
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Does the speed of the water exiting the cylinder increase, decrease or remain the same as it falls?
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The speed remains constant.
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(Physics II students only): Does the gravitational potential energy of the system change with time? If so, how?
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How are the answers to the above questions related?
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They all deal with speed vs. time ratios.
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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?
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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?
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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?
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If we know the mass of a domino and its velocity, how to we find its kinetic energy?
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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?
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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?
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As the box is shaken side to side the beads roll from one side to another. The shaking of the box cases the sides of the box to become inclined and as the box shakes it knocks the beads upward.
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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'?
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1:5
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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?
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This is a question that I am unable to come up with an answer that will make sense.
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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.
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I see what you mean.
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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?
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I think this occurs because the rubber bands want to balance their self and return to a state of equilibrium.
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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?
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I think frequency increases when the chain is longer because there is more tension in the chain and the motion can travel in a straighter path and the frequency in the shorter length slows because there is less tension and the motion has to travel down and then back up the bands.
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