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Edexcel International A level (IAL): Physics Unit 6 (WPH06) - 19th May, 2016 - PM

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Reply 60
Avatar for tgygt
tgygt
2
Original post by jasonqqqq
no 1 uncertainity is about 0.014 i use the gradent and multyply 0.002mthen %u is 2.2%


Did you draw the worst fit line?
i draw a very good best fit line in the last question... almost all the points can on it
Reply 62
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tgygt
2
Btw, can I quote % uncertainty to 1SF instead of 2SF?
Reply 63
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tgygt
2
Original post by jasonqqqq
i draw a very good best fit line in the last question... almost all the points can on it


How do you find uncertainty in question 1 using gradient?
i found the in mark scheme almost all of them are 2sf so i have written 2 sf
just use 7.14X 0.002 = 0.0014N
Reply 66
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tgygt
2
Original post by jasonqqqq
just use 7.14X 0.002 = 0.0014N


Why?
uncertainity / uncertainity = constant

so use constant to calculate the another uncertainity..

but i am not sure is it correct..
Reply 68
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tgygt
2
How about precaution for the capacitor question?
Reply 69
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oli4rg
Original post by tgygt
How about precaution for the capacitor question?


In a past paper the answer was to check the orientation of the capacitor, to prevent overheating I believe
(edited 7 years ago)
Reply 70
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oli4rg
Correct orientation to avoid over heating, this was in a past paper
Reply 71
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tgygt
2
Original post by oli4rg
Correct orientation to avoid over heating, this was in a past paper


This is for preventing it from damage
I'm asking about next part of the question (precaution for getting accurate reading)
Reply 72
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oli4rg
Original post by tgygt
This is for preventing it from damage
I'm asking about next part of the question (precaution for getting accurate reading)


Oh, sorry- because I was taking readings ever 5 seconds I said that the stopwatch should be close to the voltmeter to try reduce errors formed when taking simultaneous readings
Reply 73
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tgygt
2
Original post by oli4rg
Oh, sorry- because I was taking readings ever 5 seconds I said that the stopwatch should be close to the voltmeter to try reduce errors formed when taking simultaneous readings


Why would you use stopwatch?
This experiment is not the same with the previous one in past paper
Reply 74
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oli4rg
Original post by tgygt
Why would you use stopwatch?
This experiment is not the same with the previous one in past paper


I was taking the voltage levels per 5 seconds whilst charging so V1 then again for V2 so I had multiple results to plot but idk ...
For the uncertainity in question 1 I found the max possible value of W1 minus minimum possible value . and then divide by 2
I got something like 0.015N
Reply 76
Avatar for Kev__
Kev__
1
Original post by Owais.ik
For the uncertainity in question 1 I found the max possible value of W1 minus minimum possible value . and then divide by 2
I got something like 0.015N


same approach, but i forgot to divide it by two, is that ok? cuz full range for uncertainty is sometimes ok😵
(edited 7 years ago)
Reply 77
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tgygt
2
Original post by Kev__
same approach, but i forgot to divide it by two, is that ok? cuz full range for uncertainty is sometimes ok😵


Yea It's okay!
Original post by Kev__
same approach, but i forgot to divide it by two, is that ok? cuz full range for uncertainty is sometimes ok😵

Well I have seen papers with uncertainity as either full or half range. So there's chance that it is correct
Reply 79
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Kev__
1
it said sth like the uncertainty of l is 0.2 mm as i recall

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