Official OCR New Spec AS Level Physics: Depth in physics - 9th of May

For the question that asked for proof I did:

The percentage error was 2.04% but I wrote 1.02% because I forgot to multiply by 2 as it was L^2.

i did similar but used force x distance for W and then defined force as mass x acceleration

For all the confusion about the velocity question. The question specifically told us to work out the velocity using the answer that they give you for time which is 0.6s not what you get. That should give you 30ms. I am thinking due to the peculiar wording on that question, ocr will not mind if you used your own answer for time.

No im pretty sure they said using your answer to part i) show that the velocity is about 30m/s

No im pretty sure they said using your answer to part i) show that the velocity is about 30m/s

Hey i used 30. I got a value of 30.7. Is that correct

Nice; for the one about how to know if the diameter had changed; did you write about how the reading on the ohm meter would change.I wrote since R=pl/A and p and l were constant if R changed so would A and so the diameter will have changed. BTW why did they use the metal plates, i wrote in order to reduce contact resistance but idk if that's correct.

For that question I assumed they wanted practical answers since it sasid at the top its an investigation - but im not sure.

For the diameter I said they should measure it with a micrometer in several places or use a cyclinder as a mould.

For the metal plate I said that larger length means that the uncertainty would be lower hence giving more accurate results

Anyway put the same?

I said it would reduce the effect of random errors as it's easier to connect the circuit, I think you will get the marks though. Do you think I may have gotten the mark

For the gradient I only put 5.7 instead of 5.7 x 10^3 but then when I calculated the resistivity I factored in the x 10^3 and got an answer of 0.108. Will I lose a mark for the gradient?

i did similar but used force x distance for W and then defined force as mass x acceleration

Did anyone get 7.5 for the gradient?

& for the percentage uncertainty question did anyone get 2.04%?

I said it would reduce the effect of random errors as it's easier to connect the circuit, I think you will get the marks though. Do you think I may have gotten the mark

Honestly, it depends because the answers for practical questions sometimes are specific and sometimes have a lot of possible answers - its just 1 mark though so dont worry about it.