M2( Edexcel): quick question on strangely (?) worded question

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bluenotewitt
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#1
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#1
Here is the question with the part I am interested in highlighted:
Name:  ambiguous.PNG
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Now, what does "in the third second of motion " mean?
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Radioactivedecay
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#2
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#2
It means 3 seconds after it started moving...
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FryOfTheMann
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#3
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#3
I presume you're talking about the question from June 2016 (I can't see the attachment if you have added one) :
The question wants you to find the distance traveled between t=2 and t=3. You can do this by integrating v (velocity, to get x, displacement) with t=2,3 as your boundaries. Also, you could use suvat and find the difference.
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bluenotewitt
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#4
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#4
(Original post by Radioactivedecay)
It means 3 seconds after it started moving...
Yeah, I got that
But surely one can only travel a certain distance in an interval of time?! Wouldn't the distance travelled in the third second be 0, as it is a point in time and not an interval?
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bluenotewitt
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#5
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#5
(Original post by FryOfTheMann)
I presume you're talking about the question from June 2016 (I can't see the attachment if you have added one) :
The question wants you to find the distance traveled between t=2 and t=3. You can do this by integrating v (velocity, to get x, displacement) with t=2,3 as your boundaries. Also, you could use suvat and find the difference.
Thanks! I hope you can view my attachment by now.
How do you know that one is supposed to find the distance traveled between t=2 and t=3? I don't see how one could possibly determine that just by reading the question...?! Am I missing some edexcel lore here?
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rhaegar448
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#6
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#6
(Original post by bluenotewitt)
Yeah, I got that
But surely one can only travel a certain distance in an interval of time?! Wouldn't the distance travelled in the third second be 0, as it is a point in time and not an interval?
The third second is between 2 and 3
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Radioactivedecay
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#7
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#7
(Original post by bluenotewitt)
Yeah, I got that
But surely one can only travel a certain distance in an interval of time?! Wouldn't the distance travelled in the third second be 0, as it is a point in time and not an interval?
A is an interval not a point. So 0 to 1 is the first second, 1 to 2 is the second and 2 to 3 is the third second. Hence the q is asking for the integral from 2 to 3
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bluenotewitt
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#8
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#8
Here is the markscheme:
http://pmt.physicsandmathstutor.com/...%20Edexcel.pdf
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FryOfTheMann
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#9
(Original post by bluenotewitt)
Thanks! I hope you can view my attachment by now.
How do you know that one is supposed to find the distance traveled between t=2 and t=3? I don't see how one could possibly determine that just by reading the question...? Am I missing some edexcel lore here?
Yeah, I can see it now - thanks. Likely a problem on my end, to be honest. I admit the question is a bit confusing, I originally thought it just meant how far it had traveled in the first three seconds but now I guess you just have to infer that it is the very start of the 3rd second to the very end (hence 2 and 3 as the boundaries). Might be something to keep in mind for the exam.
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bluenotewitt
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#10
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#10
Lol, sorry just got it ...
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Prasiortle
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#11
(Original post by bluenotewitt)
Here is the markscheme:
http://pmt.physicsandmathstutor.com/...%20Edexcel.pdf
Did you not see post #7, which answers your question? A second is not a point in time, but an interval, so all time between t=0 and t=1 falls within the 1st second, time between t=1 and t=2 falls within the 2nd second, time between t=2 and t=3 falls within the 3rd second, etc.
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bluenotewitt
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#12
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#12
(Original post by FryOfTheMann)
Yeah, I can see it now - thanks. Likely a problem on my end, to be honest. I admit the question is a bit confusing, I originally thought it just meant how far it had traveled in the first three seconds but now I guess you just have to infer that it is the very start of the 3rd second to the very end (hence 2 and 3 as the boundaries). Might be something to keep in mind for the exam.
Thanks! Literally just understood what they meant...
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bluenotewitt
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#13
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#13
Why not just ask interesting questions and not boring catch out questions, edexcel ?
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Prasiortle
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#14
(Original post by bluenotewitt)
Why not just ask interesting questions and not boring catch out questions, edexcel ?
This is an entirely standard and trivial piece of terminology and I have never previously come across a student who was confused by it. You seem to keep thinking that it was supposed to catch you out when the fact is that it wasn't: rather, you simply were confused about what the English word "second" means.
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bluenotewitt
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#15
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#15
(Original post by Prasiortle)
This is an entirely standard and trivial piece of terminology and I have never previously come across a student who was confused by it. You seem to keep thinking that it was supposed to catch you out when the fact is that it wasn't: rather, you simply were confused about what the English word "second" means.
maybe... I was just joking around a bit tbh.
never seen a student defend edexcel

Seriously, though I doubt I am the only one who finds this question a bit confusing (at first). Also reading a question at home on ones computer with a cup of tea is not that same as sitting in an exam hall under adrenalin... I mean I've literally added one digit numbers up wrong in some of my gcse exams .
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Prasiortle
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#16
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#16
(Original post by bluenotewitt)
maybe... I was just joking around a bit tbh.
never seen a student defend edexcel

Seriously, though I doubt I am the only one who finds this question a bit confusing (at first). Also reading a question at home on ones computer with a cup of tea is not that same as sitting in an exam hall under adrenalin... I mean I've literally added one digit numbers up wrong in some of my gcse exams .
I'm not a student, and back when I was, I never did an Edexcel mathematics exam.
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