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# OCR Gateway Physics B - P4 P5 P6 - Unofficial Mark Scheme

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1. (Original post by some-student)
I'm not too sure, but I think regardless of the resistance of either, the voltage comes out of the same place:
Yeah I said just one v out as well

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2. (Original post by mxskaan)
I was beginning to doubt myself, thank you so much for researching!
No problem .
3. For the boat one, I think it was Y.

For X, this diagram shows that you would get a resultant of 0m/s:

4. [ATTACH]554870[/ATTACH

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Pretty sure that the logic gates were all the ones on the left of this pic ??
Attached Images

5. (Original post by GCShElpme)
Just thought I'd add a few things. Using this, I think I've managed to get 23-4 marks- that's a good start!
Ok thanks I will update my markscheme.

And 23 or 24 is amazing!
6. b) Explain the purpose of boron rods but explain why they need to be removed some times [2]
absorb excess neutrons (NOT ELECTRONS) to stop reaction going out of control (1)
7. (Original post by some-student)
For the boat one, I think it was Y.

For X, this diagram shows that you would get a resultant of 0m/s:

BBC bitesize says:

"For example, two cars may be travelling at 15 m/s. If they are side by side and travelling in the same direction, their relative speed is zero. Someone looking across from one car to the other will see the other car keeping pace with them. However, if the two cars are travelling in opposite directions, their relative speed will be 30 m/s (15 + 15)."

Very confused now.
8. (Original post by Tea2345)
[ATTACH]554870[/ATTACH

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Pretty sure that the logic gates were all the ones on the left of this pic ??
9. (Original post by some-student)
Ok thanks I will update my markscheme.

And 23 or 24 is amazing!
Thank you! Maybe that'll make up for my other stupid mistakes in P5, aha.
10. (Original post by mallington11)
b) Explain the purpose of boron rods but explain why they need to be removed some times [2]
absorb excess neutrons (NOT ELECTRONS) to stop reaction going out of control (1)
Woops - was a typo
11. (Original post by mxskaan)
BBC bitesize says:

"For example, two cars may be travelling at 15 m/s. If they are side by side and travelling in the same direction, their relative speed is zero. Someone looking across from one car to the other will see the other car keeping pace with them. However, if the two cars are travelling in opposite directions, their relative speed will be 30 m/s (15 + 15)."

Very confused now.
I just found this aswell:

Very confused too
12. (Original post by some-student)
For the boat one, I think it was Y.

For X, this diagram shows that you would get a resultant of 0m/s:

I asked my physics teacher and she said 'if you are speaking about relative velocity you add them if they're going in the opposite direction'.
13. (Original post by mallington11)
So there wasn't a nor gate like everyone is saying ?

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14. (Original post by Wolfram Alpha)
I asked my physics teacher and she said 'if you are speaking about relative velocity you add them if they're going in the opposite direction'.
I'm so confused... I'll put both answers on the mark scheme
15. (Original post by Tea2345)
So there wasn't a nor gate like everyone is saying ?

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The gate they gave us does not exist on the internet! Lol, I actually cannot find it...
16. So angry, knew that the logic gates was a NOR gate but I thought they wouldn't include that in the exam, so I interpreted it as a OR gate. OH FFS.
17. (Original post by Chittesh14)
So angry, knew that the logic gates was a NOR gate but I thought they wouldn't include that in the exam, so I interpreted it as a OR gate. OH FFS.
I thought it was a NOT gate

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18. For the p6 6 marker I only wrote 0.4 s not 0.45s would I still get the marks ?
19. (Original post by Tea2345)
I thought it was a NOT gate

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No, the last one before the output - there was an OR gate with a circle behind it.
20. (Original post by mxskaan)
BBC bitesize says:

"For example, two cars may be travelling at 15 m/s. If they are side by side and travelling in the same direction, their relative speed is zero. Someone looking across from one car to the other will see the other car keeping pace with them. However, if the two cars are travelling in opposite directions, their relative speed will be 30 m/s (15 + 15)."

Very confused now.
That's relative but they asked for resultant

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