tw05 Posted May 11, 2009 Report Share Posted May 11, 2009 i am working on this portfolio task and it's due tomorrow.my class and i are absolutely stumped on what we can suggest for how it can be useful in other situations. "other elevators" is about as far as we've got, but im not sure that thats really what they're after.any thoughts asap would be much appreciated Reply Link to post Share on other sites More sharing options...
Panserborne Posted May 11, 2009 Report Share Posted May 11, 2009 i am working on this portfolio task and it's due tomorrow.my class and i are absolutely stumped on what we can suggest for how it can be useful in other situations. "other elevators" is about as far as we've got, but im not sure that thats really what they're after.any thoughts asap would be much appreciatedWell, like you said, can your model be applied to other elevators? Is it limited to use in mine shafts, or could you use the model in skyscrapers and office buildings, or to do so, how much would you have to modify it? Is it limited to this one mine shaft, or could it be used for different ones, at different depths? Things like that, I think you'll find enough to talk about. Reply Link to post Share on other sites More sharing options...
mixtape Posted May 30, 2009 Report Share Posted May 30, 2009 (edited) I don't understand how an elevator works, can someone please enlighten me?Does an elevator have the same speed up and down? Why/why not? If it does, would it still have the same speed up and down, if it on the way down the elevator was empty and on the way up heavy loaded? Edited May 30, 2009 by mixtape Reply Link to post Share on other sites More sharing options...
XWT Posted June 1, 2009 Report Share Posted June 1, 2009 question 1 d) evaluate the usefulness and identify the problems......is ambiguous...what kind of usefulness is the teacher asking here...and what kind of problems?can anyone give example? Reply Link to post Share on other sites More sharing options...
Annla Posted June 4, 2009 Report Share Posted June 4, 2009 hi，guys. i just got this task a couple of days ago. what i don't understand is that can we use the points that are worked out by the given equation?? Reply Link to post Share on other sites More sharing options...
cpresident Posted June 13, 2009 Report Share Posted June 13, 2009 Hi sorry my portfolio is due in 30 hours and I'm stuck at question 3Can anyone please give me a hint how to solve it? I mean, some more hints. It's still freakin me outwhat I know is when t=0, y must be 0. and when t=6, y=0, v=0,a=0. basically everything has to stopand SO WHAT's NEXT?PLEASE Reply Link to post Share on other sites More sharing options...
denominator Posted August 31, 2009 Report Share Posted August 31, 2009 hmmm..i'm also having problem with the first few questions. i kno what to write but don't exactly know how to write it down. any tips? Reply Link to post Share on other sites More sharing options...
Argiyama Posted September 12, 2009 Report Share Posted September 12, 2009 Ok, basically I have done this investigation and it is due this Monday. However, I'm not certainly sure one part of this assignment. Question number 3, it asked to "interpret what this means mathematically"? what exactly does that mean? I have got my new model and new function and everything. I don't know what they mean by explain mathematically? since all we have is a function and I just explain what the signs mean and the velocity/acceleration at each interval. I don't know if that consider "mathematically". Suggestion will be really appreciated. Thank you Reply Link to post Share on other sites More sharing options...
kuffour Posted September 24, 2009 Report Share Posted September 24, 2009 I have no idea how to start this portfolio....... its due next week friday and i haven't started anything... could someone please guide me through the beginning of the portfolio............... i would really appreciate it.... thank you in advance..... Reply Link to post Share on other sites More sharing options...
mephisto275 Posted November 10, 2009 Report Share Posted November 10, 2009 Having been given this IA also, I have come across one problem that is racking my brain. When an object comes to rest, its velocity is obviously zero, however it doesn't necessarily mean that the acceleration has to be zero, right? For example, as the elevator is nearing the bottom of the mine shaft, it should be decelerating, meaning its acceleration value should be becoming more negative. It decelerates to a point where the elevator stops, and then continues up to the surface, however the acceleration doesn't go to zero at that moment, because the velocity is changing. It doesn't seem to make since that as an object comes to a stop, it still has acceleration, especially when the elevator is at the top of the mine shaft, either before entering it or after exiting it. This right now is the main problem I am having in explaining the validity of my own model. Hopefully someone who has a better grasp of physics can help. : ) Reply Link to post Share on other sites More sharing options...
sweetnsimple786 Posted November 10, 2009 Report Share Posted November 10, 2009 I haven't done this IA, so there's a good chance that I'm not understanding you at all, but if the elevator comes to a rest, I think you're implying that it has stopped. When it comes to a stop, I think it stays at a stop for a certain significant amount of time so that the acceleration goes to zero as well. If the elevator reaches the bottom and stops, it's no longer accelerating [aka changing velocity over some amount of time]. But when the velocity goes from positive to negative or vice versa, you're correct in saying that the acceleration isn't zero. One more thing which may be irrelevant--decelerating is meant to mean decreasing the acceleration, from what I understand. Increasing the magnitude of acceleration in the negative direction is accelerating. Hope that was somewhat helpful. Reply Link to post Share on other sites More sharing options...
mephisto275 Posted November 10, 2009 Report Share Posted November 10, 2009 I haven't done this IA, so there's a good chance that I'm not understanding you at all, but if the elevator comes to a rest, I think you're implying that it has stopped. When it comes to a stop, I think it stays at a stop for a certain significant amount of time so that the acceleration goes to zero as well. If the elevator reaches the bottom and stops, it's no longer accelerating [aka changing velocity over some amount of time]. But when the velocity goes from positive to negative or vice versa, you're correct in saying that the acceleration isn't zero. One more thing which may be irrelevant--decelerating is meant to mean decreasing the acceleration, from what I understand. Increasing the magnitude of acceleration in the negative direction is accelerating. Hope that was somewhat helpful.Thanks for responding so fast! But that was what I was afraid of. It only makes since that an object coming to rest for a significant amount of time would have an acceleration of zero. Unfortunately my model doesn't take this into account apparently, and its too late to change it now. Oh well : ) Reply Link to post Share on other sites More sharing options...
sweetnsimple786 Posted November 10, 2009 Report Share Posted November 10, 2009 Hmm. Well significant doesn't have to be "long" but it needs to be prolonged, if that makes sense... hahah. Reply Link to post Share on other sites More sharing options...
mephisto275 Posted November 10, 2009 Report Share Posted November 10, 2009 (edited) haha, that was how I tried explaining it away in the paper, by arguing that it was simply caught in a moment of being instantaneously motionless I guess I'll see how my teacher wants to score that! I like your avatar by the way...*cough cough* I lost *cough cough* Edited November 10, 2009 by mephisto275 Reply Link to post Share on other sites More sharing options...
Sunshine :D Posted December 26, 2009 Report Share Posted December 26, 2009 (edited) hi! i'm doing this portfolio as well.I really need some help since it's due soon. So, i'm in the process of making my model. I made a piece wise function for each time interval until t=3. My problem is that i'm not getting negative values for the distance... since the elevator is going into the ground ( a mine). I al however, getting the values that i want, except they are positive and not negative. I thought to just putting a negative sign around each of the piece functions, but i don't know if that's right. I wanted to find a way to figuring out how to make the functions so that the distances are negative and not positive with the same values.Also, in the previous posts, i noticed ppl making thie model so that the bottom most distance is 80m... I made mine 100m, cuz i thought that's the bottom of the shaft and the elevator should go until there...Any help will be most appreciated! thanksone more thing... what's the deal with looking at the motion along the line x = -1. on the graph, the elevator's path doesn't come near that line : i graphed it in parametric mode, where x = T Edited December 26, 2009 by Mahuta ♥ Please use the edit option rather than multi-posting, thanks- Maha Reply Link to post Share on other sites More sharing options...
nigoat Posted January 2, 2010 Report Share Posted January 2, 2010 [quote name=Sunshine ' date='Dec 26, 2009 - 18:12' timestamp='1261865542' post='60713]Also, in the previous posts, i noticed ppl making thie model so that the bottom most distance is 80m... I made mine 100m, cuz i thought that's the bottom of the shaft and the elevator should go until there...I'm confused about this as well. I thought that our models should ideally go to 100m and the given model just failed at that.But other people are making their models go to 80m...are our models SUPPOSED to go to 80m? or 100m? Reply Link to post Share on other sites More sharing options...
DJ CAS Posted February 27, 2010 Report Share Posted February 27, 2010 Discussion on this coursework here.Does anyone know what to do for Question 2?Math Portfolio Samples 2010.pdf Reply Link to post Share on other sites More sharing options...
strawberry_pink Posted April 3, 2010 Report Share Posted April 3, 2010 hello everybody,well.. my maths portfolio topic is freight elevator, and i am still stuck up with this 2nd 9b) bit. redesigning my own model. i am unable to understand how? well like am i supposed to take the power of the lift and the mass of theload, the maximum carrying capacityof the lift, etc. how do i start modelling the function? am i supposed to start with velocity adn then differentiate it to accleration, or start with accleration, or start with velocity. lease do help. my submission date is nearing...plzzzzzzzzzzzz...ny1...!!! Reply Link to post Share on other sites More sharing options...
agusfontes Posted August 18, 2010 Report Share Posted August 18, 2010 hi!can you tell me which programme did you use to de this task?thank you very much because i am haveing some problems with the ones i had found. Reply Link to post Share on other sites More sharing options...
iliee Posted August 22, 2010 Report Share Posted August 22, 2010 I have done until 1 © and I assume that the weaknesses of the elevator is that it will not stop at t = 6 as the velocity is not zero? And the time taken to go down is longer than going up? Any other weaknesses that you guys have identified? Oh, and I wonder why at t=0, the acceleration still has a value instead of zero? Reply Link to post Share on other sites More sharing options...
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