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# Edexcel IAL Physics Unit 3 WPH03 May June 2016 Discussion

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1. (Original post by don't cry-craft)
how can there be a parallax error since the protractor would be flat against the paper to measure the angle?
There could be parallex error when taking reading from protractor
2. I got the percentage as 7.89 %(i guess)
I did not multiply by 2

Is it correct
3. (Original post by NNB_Herath)
I got the percentage as 7.89 %(i guess)
I did not multiply by 2

Is it correct
Yes absolutely correct
4. Hey guys can someone send me the questions along with the marks
Thanks
5. mark scheme for a past paper said DO NOT allow parallax for protractor
6. Did some of ur answers look like this?:

multiple choice: A,D,A,B,D (directly proportional, velocity, 10.27, can't remember the other 2)

7.9%
resistivity: 1.1 x10^-6

I didn't think it was too bad wbu
7. (Original post by AlonsoAMG)
Did some of ur answers look like this?:

multiple choice: A,D,A,B,D (directly proportional, velocity, 10.27, can't remember the other 2)

7.9%
resistivity: 1.1 x10^-7

I didn't think it was too bad wbu
The resistivity was ***x10^-6 something
8. (Original post by AlonsoAMG)
Did some of ur answers look like this?:

multiple choice: A,D,A,B,D (directly proportional, velocity, 10.27, can't remember the other 2)

7.9%
resistivity: 1.1 x10^-7

I didn't think it was too bad wbu
It's not directly proportional,It's linear relationship and the other two mcqs were finding g and mean value
I got 4.73 for gradient and 1.17x10^-6 for resistivity and 7.9% for uncertainty.
9. is parallax error wrong
10. (Original post by tejsanghavi)
did anyone get their gradient as 4.5?
I made a major error.... i used the diameter on its own as area. how much do you guys think ill get out of 4?
For keeping current constant i mentioned using a power pack set at 0.11A. Any chance its correct?
11. It is velocity, as pascal is a derived unit.
12. (Original post by OnTheHorizon)
It's not directly proportional,It's linear relationship and the other two mcqs were finding g and mean value
I got 4.73 for gradient and 1.17x10^-6 for resistivity and 7.9% for uncertainty.
why not proportional? it went through 0,0 didn't it?
13. (Original post by iWant.A)
For her plan I calculated the percentage uncertainty which was about 12% and said that it was too high, also to keep current constant with a variable resistor
What did you answer for the vernier calliber question
i guessed 33%
14. (Original post by Sunethra)
I got gradient at 4.91, I did again using different figures and it came to 4.88.
line should go through 0, urs probably didn't tho the probe won't take off marks as they didn't get a result for 0m
15. (Original post by AlonsoAMG)
Did some of ur answers look like this?:

multiple choice: A,D,A,B,D (directly proportional, velocity, 10.27, can't remember the other 2)

7.9%
resistivity: 1.1 x10^-6

I didn't think it was too bad wbu
it was linear
16. (Original post by AlonsoAMG)
why not proportional? it went through 0,0 didn't it?
no it didnt pass through origin
18. (Original post by MrBioBombastic)
no it didnt pass through origin
if you extrapolated it it would cos x-axis started at 2, not 0
19. (Original post by AlonsoAMG)
i guessed 33%
uncertainity was 7.8
20. (Original post by Hiyoriiki)
For the comment on time q I multiplied 0.38×2 and then divided by 3 x 100So rxn time is 25% of actual time.Is it wrong😢😢😢?
(Original post by bibliosmia)
I got the same as Hyyoriiki!
Wrote the same answer, as both of you.

(Original post by NNB_Herath)
I got the percentage as 7.89 %(i guess)
I did not multiply by 2

Is it correct
The %Uncertainty, had to be given in 2 s.f rather then 3 s.f because the data given in the question was 2 s.f max.

I think, I remember writing 7.9 (%) as the answer.

(Original post by OnTheHorizon)
Did not get a negative gradient whatsoever,

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