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# OCR B Physics H157/01 Fnd in Physics 24th May 2016

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1. OCR Physics B 24th May 2016

NB: This is not OCR Physics A.
Revision Resources

PhysicsNet
Waves
Mechanics
Materials
Current Electricity

Physics and Maths Tutor
This is excellent, there are revision notes, summary sheets, questions from past exam papers separated by topic and other worksheets.

Module 1: Practical Skills in Physics
Module 2: Fundamental Data Analysis
Module 3: Physics in Action
Module 4: Understanding Processes

OCR Resources
Sample Paper
Specification

If anybody has access to the practice paper that they haven't released publicly, I think it would help people if they were posted.
2. How did people find that?

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3. much easier than the sample paper, it found it quite nice. How did you calculate the force in the collision?
4. What was that? Holy moly that was hard
5. (Original post by danigr)
much easier than the sample paper, it found it quite nice. How did you calculate the force in the collision?
Agreed. I found the total momentum in the question before and divided by time

Posted from TSR Mobile
6. (Original post by danigr)
much easier than the sample paper, it found it quite nice. How did you calculate the force in the collision?
I found the acceleration of one of the cars using a=v-u/t then multiplied by the mass of the same car

It was something like 2MN - really big
7. That was proper solidthat liark
Specimen paper was piss compared to that
8. For the last few multiple choice questions I kept finding myself putting B and D
9. I thought it was aite 👍 harder the one of the specimen papers but easier than the other
10. Might have scraped an E, gonna have to ace the depth exam
11. So hard!

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12. Got 24.63 for the velocity of the crash or something like that
13. In the question about the diods, how could you estimate the current?, I got first an estimate for the resistance of the diod (0.7) and then V=I/(R+0.7)
14. Did anybody get the 4 mark diode question towards the end? Wtf
15. (Original post by Lion_E)
Did anybody get the 4 mark diode question towards the end? Wtf
I just evaluated it.
I had no time to do any calculation so I just talked about how the diodes would be used to dissipate additional power in the circuit.
16. (Original post by danigr)
In the question about the diods, how could you estimate the current?, I got first an estimate for the resistance of the diod (0.7) and then V=I/(R+0.7)
Can't remember but I got 12.5 ohms for the fixed resistor😁
17. (Original post by Watevaidc)
Can't remember but I got 12.5 ohms for the fixed resistor😁
Yes, 12.5 ohms
18. (Original post by Lion_E)
Did anybody get the 4 mark diode question towards the end? Wtf
Apparently didoes only let current travel in one direction i didnt know that until after the exam...
19. I said the current would be higher in the diodes and not in the ammeter and did some calculations i just guessed.
20. (Original post by danigr)
Yes, 12.5 ohms
To get the resistance of the diode I drew a triangle to get the gradient of the diode and then did 1/gradient to get the resistance (because the graph was I/V)

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