How was physics paper 33

[angelicsuccubus]

Okay so if my k values were 0.0933 and 0.133 then whats the percentage difference?

 

[Hertz]

gradient 0.0685
y intercept 0.836
k1 = 740, k2 = 550 (i took it in meters)
temp change in cup =3
temp change in bowl =5
Hope this helps u or scares the shit out of u
Like n Reply if ur getting same or something

 

[angelicsuccubus]

I have a feeling that there was something in the practical which half the people took in one way and the other half took the other cause the one's who got a positive graph can't think of what went wrong and the one's who got a negative graph can't either. However Im reallyyy curious about people who got positive graphs... can you please put your table of values up?

This is what a negative graph's table of values was like for the candidates:

 

[aom]

I have a feeling that there was something in the practical which half the people took in one way and the other half took the other cause the one's who got a positive graph can't think of what went wrong and the one's who got a negative graph can't either. However Im reallyyy curious about people who got positive graphs... can you please put your table of values up?

This is what a negative graph's table of values was like for the candidates:

View attachment 9738

the only thing is that some people took Kg (which is right) and some others took grams

 

[Ahmed Tariq]

the only thing is that some people took Kg (which is right) and some others took grams

There's nothing wrong with using grams.

 

[Hamza]

Oh... i finally get it... The difference was that some people had attached fixed mass to the longer string on the right with one spring (which was correct) while others had attached fixed mass to the shorter string with the two springs. Thats the error. Finally hit it.

And btw, i have clarified it before with reference to the markscheme. "IT DOESN'T MATTER WHAT UNIT YOU USE"
Mark scheme allows you to use any units. You can use g or kg, m or cm or mm. DOESN'T MATTER.

 

[Casablanca]

If I used (k2-k1)/k2 x 100, I would've gotten, like, 120% error. When I used the formula the other way round, it was around 60% error. I'm pretty sure I messed up there, but at least this value was slightly more acceptable.

 

[angelicsuccubus]

the only thing is that some people took Kg (which is right) and some others took grams

yeh they didnt ask for the units to be changed to grams.. infact in the question it was given as 150g so why would you change it unneccessarily to make your values into non integers? -_-"

 

[angelicsuccubus]

Oh... i finally get it... The difference was that some people had attached fixed mass to the longer string on the right with one spring (which was correct) while others had attached fixed mass to the shorter string with the two springs. Thats the error. Finally hit it.

And btw, i have clarified it before with reference to the markscheme. "IT DOESN'T MATTER WHAT UNIT YOU USE"
Mark scheme allows you to use any units. You can use g or kg, m or cm or mm. DOESN'T MATTER.

I dont think that was it.. cause the kids in my school all attached it to the right (the correct one) but they all had a positive graph and i had a negative graph..

 

[angelicsuccubus]

Oh... i finally get it... The difference was that some people had attached fixed mass to the longer string on the right with one spring (which was correct) while others had attached fixed mass to the shorter string with the two springs. Thats the error. Finally hit it.

And btw, i have clarified it before with reference to the markscheme. "IT DOESN'T MATTER WHAT UNIT YOU USE"
Mark scheme allows you to use any units. You can use g or kg, m or cm or mm. DOESN'T MATTER.

and that would make no sense.. any idiot would have noticed if the mass was on the wrong string because they wouldnt have been able to adjust h by moving just one clamp.

 

[thunderingthunder]

gradient 0.0685
y intercept 0.836
k1 = 740, k2 = 550 (i took it in meters)
temp change in cup =3
temp change in bowl =5
Hope this helps u or scares the shit out of u
Like n Reply if ur getting same or something

I DIDN'T get all results lyk yours..Only the temp change in the cup is almost same(got it 4):O

 

[angelicsuccubus]

I DIDN'T get all results lyk yours..Only the temp change in the cup is almost same(got it 4):O

lol we had ACs blasting in the room so my temp for the cup decreased by 5 degrees and for the bowl decreased by 7 degrees

 

[BHS17]

Oh... i finally get it... The difference was that some people had attached fixed mass to the longer string on the right with one spring (which was correct) while others had attached fixed mass to the shorter string with the two springs. Thats the error. Finally hit it.

And btw, i have clarified it before with reference to the markscheme. "IT DOESN'T MATTER WHAT UNIT YOU USE"
Mark scheme allows you to use any units. You can use g or kg, m or cm or mm. DOESN'T MATTER.

What I think the problem was that people took decreasing masses instead of increasing them.... MAYBE

 

[thunderingthunder]

lol we had ACs blasting in the room so my temp for the cup decreased by 5 degrees and for the bowl decreased by 7 degrees

ok..but the gradient and the y-intercept is not same either:S

 

[thunderingthunder]

I have a feeling that there was something in the practical which half the people took in one way and the other half took the other cause the one's who got a positive graph can't think of what went wrong and the one's who got a negative graph can't either. However Im reallyyy curious about people who got positive graphs... can you please put your table of values up?

This is what a negative graph's table of values was like for the candidates:

View attachment 9738

I got a POSITIVE GRADIENT:S

 

[angelicsuccubus]

ok..but the gradient and the y-intercept is not same either:S

yeh mine either.. my y intercept was 0.0006 and my gradient was -0.15

 

[angelicsuccubus]

I got a POSITIVE GRADIENT:S

okay I need you to answer every question Im about to type:

1) Which string did you hang the masses on? Short one or long one?
2)What was your h. (the fixed one) ?
3)Were your values for (h.-h)/m increasing as (1/m) decreased or were they both increasing or decreasing?
4)Did you plot (1/m) on the x axis?
5)Did your h value decrease by 0.02m or 0.03m every time you added a weight?

 

[angelicsuccubus]

What I think the problem was that people took decreasing masses instead of increasing them.... MAYBE

that doesnt change anything.. if they took decreasing masses then their (h.-h)/m values would have increased ... anyway how can they take decreasing masses? start from 350 and go to 150? The fricking inverse proportionality does not change!

 

[BHS17]

that doesnt change anything.. if they took decreasing masses then their (h.-h)/m values would have increased ... anyway how can they take decreasing masses? start from 350 and go to 150? The fricking inverse proportionality does not change!

Yup that wont cause any difference Then how the hell did people get a positive gradient???? DID U?

 

[angelicsuccubus]

Yup that wont cause any difference Then how the hell did people get a positive gradient???? DID U?

no! i got a negative gradient.. no way in hell could I get a positive gradient.. I donno wtf they did to their values?!