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# OCR 21st Century Science Physics P4 P5 P6 *Unofficial Mark Scheme 2016* Watch

1. (Original post by kennethdcharles)
I'm too sure here are more points for the P5 6 marker:
- increasing the number of pathways means the current gets shared, and therefore it is less in each wire
- this therefore reduces the resistance
- she could improve by using a wider range and more intervals to help get a clear trend

For the P6 six marker, that's all the points I got for why her worries were unfounded of.
Thank you! I knew I mentioned pathways somewhere!
2. (Original post by kennethdcharles)
Oh good thank you
3. (Original post by Mr_Elmo)
Anyone else give their answer to the nuclear energy question in standard form? I put 4.5x10^9 but i guess it should be okay
I did

(Original post by NiamhM1801)
Oh, there was also a question about how high level waste is dealt with. Does anyone know where that was?
I think that one was quite near the end

(Original post by NiamhM1801)
I put mine in standard form too, but I got the wrong answer (I somehow wound up with 4.5x10²⁵!! )
You must have used 5.0x10^8 rather than 5.0x10^-8
4. (Original post by FIIIRRRE285)
Did I read the graph incorrectly because wasn't the average speed 150/20 which is 7.5 m/s?
it was 130/20
5. (Original post by FIIIRRRE285)
Did I read the graph incorrectly because wasn't the average speed 150/20 which is 7.5 m/s?
No because even though the axis went up to 150, the line only went up to 130, so it was 130/20 = 6.5

(Original post by NiamhM1801)
Did anyone else wonder how Sarah could even get a reading in her resistance meter without a battery in the circuit??
That's exactly what I thought when I looked at it! I read the question and I was thinking well actually, Sarah wouldn't have got any readings from anything without a power source in the circuit
6. (Original post by 11207ymir)
I think the first 2are wron as you do 5*4= 20
And for the second one I got 10j
Im pretty sure it was 5×4=20 but the empty box weighed 2N so it would make 22N
7. (Original post by Ben.M)
I think that one was quite near the end

You must have used 5.0x10^8 rather than 5.0x10^-8
Yeah, I've just put it at the end of the mark scheme.

Argh!! My calculator is now 5 years old and so some of the keys are a bit dodgy and don't press - I KNEW it would mess me up in at least one exam!!
(Original post by Ben.M)
That's exactly what I thought when I looked at it! I read the question and I was thinking well actually, Sarah wouldn't have got any readings from anything without a power source in the circuit
Yeah my friends thought it too! One of them actually wrote putting a battery in as one of the improvements she could make haha - it did confuse me a bit but then I just ignored it
8. (Original post by NiamhM1801)
Did anyone else wonder how Sarah could even get a reading in her resistance meter without a battery in the circuit??
Hey sorry this isn't related to that question but I'm kind of thinking worse case scenario here, If I got a low B in p123 and in p456, but an average A* in coursework, whats the best grade I could get?
(bearing in mind I still have p7 to go)
Thanks!
9. At first I put 22N for the first question but isnt force mass x acceleration which on Earth can be assumed to be 10m/s^2 so isnt it 220N? so annoyed with myself on some of the stupid mistakes I made
10. (Original post by megannlong)
At first I put 22N for the first question but isnt force mass x acceleration which on Earth can be assumed to be 10m/s^2 so isnt it 220N? so annoyed with myself on some of the stupid mistakes I made
Weight is the force, which was already given in newtons. We weren't given mass, just weight
11. (Original post by NiamhM1801)
Yeah, I've just put it at the end of the mark scheme.

Argh!! My calculator is now 5 years old and so some of the keys are a bit dodgy and don't press - I KNEW it would mess me up in at least one exam!!

Yeah my friends thought it too! One of them actually wrote putting a battery in as one of the improvements she could make haha - it did confuse me a bit but then I just ignored it
I feared my calculator might do something wrong so I just thought laws of indices - Multiplying means add the powers so (-8) + 16 so I knew the power should be about 8.

Ahaha that's the best improvement, but I'm not sure that'll be in the mark scheme. That may not be the answer they were looking for
12. (Original post by g3ob)
Hey sorry this isn't related to that question but I'm kind of thinking worse case scenario here, If I got a low B in p123 and in p456, but an average A* in coursework, whats the best grade I could get?
(bearing in mind I still have p7 to go)
Thanks!
Probably an A, depending on how you score in P7. Coursework is only 25% and each exam is also 25%, so if 50% is a B and 25% is an A* you're looking at a low A really, but it all depends on how well you do in P7
13. (Original post by Ben.M)
I feared my calculator might do something wrong so I just thought laws of indices - Multiplying means add the powers so (-8) + 16 so I knew the power should be about 8.

Ahaha that's the best improvement, but I'm not sure that'll be in the mark scheme. That may not be the answer they were looking for
I know, admittedly I should have checked it, but I was too busy memorising my answers in the last 8 minutes to make this thing!

And I am absolutely hopeless at standard form apparently - I got it wrong in my mock, I got it wrong in the non calc maths paper and here I've gone and got it wrong again! 😂😂
14. (Original post by NiamhM1801)
I know, admittedly I should have checked it, but I was too busy memorising my answers in the last 8 minutes to make this thing!

And I am absolutely hopeless at standard form apparently - I got it wrong in my mock, I got it wrong in the non calc maths paper and here I've gone and got it wrong again! 😂😂
I did wonder how you remembered so much to make this, I forget most of the answers until someone posts something that reminds me.

Oh dear you have found a weak area!
15. (Original post by florahill)
Can someone explain how you work out the speed question (with the mass and weight), I spent ages on it and ended up guessing 1.8 for some reason
(Original post by NiamhM1801)
Gravitational potential energy at the top = kinetic energy at the bottom
So whatever numbers we were given (I don't remember them), you had to work out the GPE from them I think, then you also had kinetic energy.
Kinetic energy = 1/2 x mass x velocity². So kinetic energy x 2 = mass x velocity².
You were given the mass, so (kinetic energy x 2) / mass = velocity²
So the answer would have been the square root of (kinetic energy x 2) / mass

That probably made no sense - I can't remember the numbers given, sorry!
Change in GPE = Weight x Vertical Height Difference

You were given a 1.5m high shelf, a box with a mass of 3.2kg and a weight of 32N

So the GPE was 32 x 1.5, which equals 48

2KE/Mass = Velocity^2

48 x 2 = 96 so 96/3.2 = 30

Square root of 30 rounded to 5.5 for 2 d.p.

That's how I did it, not sure if it's right
16. (Original post by Ben.M)
I did wonder how you remembered so much to make this, I forget most of the answers until someone posts something that reminds me.

Oh dear you have found a weak area!
Haha yeah normally I'm the same - but I knew I was confident enough with my answers to make one, so got cocky and didn't check properly.

Wow don't make it sound like I'm some genius or something!! I have many weak areas...just not really in P456
17. (Original post by Ben.M)
Change in GPE = Weight x Vertical Height Difference

You were given a 1.5m high shelf, a box with a mass of 3.2kg and a weight of 32N

So the GPE was 32 x 1.5, which equals 48

2KE/Mass = Velocity^2

48 x 2 = 96 so 96/3.2 = 30

Square root of 30 rounded to 5.5 for 2 d.p.

That's how I did it, not sure if it's right
Looks good to me - that's what I would've done if I read the question properly and used the right numbers
18. (Original post by NiamhM1801)
Haha yeah normally I'm the same - but I knew I was confident enough with my answers to make one, so got cocky and didn't check properly.

Wow don't make it sound like I'm some genius or something!! I have many weak areas...just not really in P456
Key lesson don't get too confident! That's what I meant, your weaknesses don't lie in this exam content.

(Original post by NiamhM1801)
Looks good to me - that's what I would've done if I read the question properly and used the right numbers
Oh dear, so did you not read it properly and use the right numbers?
19. (Original post by Ben.M)
Key lesson don't get too confident! That's what I meant, your weaknesses don't lie in this exam content.

Oh dear, so did you not read it properly and use the right numbers?
I know...but I never learn. I did it in maths ages ago and stopped revising - safe to say my marks went down a far bit. Soon stopped that haha. Oh I see, yeah I guess so

I think I was trying to do it quickly (as I didn't want to run out of time like I did in chemistry) so I just skim read the question. For some reason I thought it was the same box from the other question part, so used 11 as the GPE and KE I ended up getting 2.622m/s as my answer - which, if the GPE was 11, would have been the right answer annoyingly. Hopefully I'll get a method mark though
20. (Original post by NiamhM1801)
I know...but I never learn. I did it in maths ages ago and stopped revising - safe to say my marks went down a far bit. Soon stopped that haha. Oh I see, yeah I guess so

I think I was trying to do it quickly (as I didn't want to run out of time like I did in chemistry) so I just skim read the question. For some reason I thought it was the same box from the other question part, so used 11 as the GPE and KE I ended up getting 2.622m/s as my answer - which, if the GPE was 11, would have been the right answer annoyingly. Hopefully I'll get a method mark though
Well after that it seems you did learn

Well it was the right method at least, so you might get some marks for that, hopefully

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