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# Physics P2 Unofficial Markscheme Edexcel.

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1. (Original post by jamiedwight)
You had to work out the GPE and that would've been the same as the maximum KE because the energy at the top of the roller coaster would convert to kinetic so they would be the same
Damn it, can't remember if I did that or not or left it blank as I thought it might be the same, ah well at least it was only 1 mark
2. For the cyclist pedalling at a constant velocity question I wrote that they had to travel the correct distance in the correct amount of time. Though, now that I think about it, it doesn't seem right??
3. (Original post by vardyisaparty)
what was the 3 marker after the voltmeter?
Which 3 marker? There was another one marker after the voltmeter question, and then a two marker which asked you to show that the value of resistance was 11 ohms.
4. (Original post by L0st45)
Which 3 marker? There was another one marker after the voltmeter question, and then a two marker which asked you to show that the value of resistance was 11 ohms.
Was it not 12?

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5. (Original post by blueribbons99)
Was it not 12?

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Might have been, I can't remember the exact value it was that we had to prove aha.
6. Oh **** yes, lots of people in my school when asked if they got 2 million and something for the rollercoaster question said I was crazy. I also worked out the GPE for the 2nd question but it was only 1 mark. I put C for the voltzs multiple question (which is correct - I asked my teacher). The only thing I ****ed up on is the last six marker as I don't think I went on enough. I used clothing and how less air resistance would act upon the cyclist. I also talked about the weight of clothing and how it can lead to deceleration. Oh, and the half life, I worked out 7 days and then then added it to 180. I know this could possible be wrong but it did say "estimate" so the mark scheme could be lenient. I think I ended up with a mass of 280g. So, my worst case scenario is a B, but I think I'm probably going to get an A.
7. i did
8. i did
(Original post by NextGenRemix)
Did anyone get 2375000 for the rollercoaster work done question?
9. (Original post by student2607)
I got 6. something, I don't think we had to work out the distance travelled by doing the area, it was just the gradient as it was for acceleration.
This is above GCSE but just to show the proof and analysis...
Didn't sit this paper but velocity=displacement/time so the gradient of the graph is acceleration if you put it in the form of y=mx then
V=velocity(m/s) S=displacement(m/s^2) t=time(s) *-means multiply
y=mx+c
Velcoity=Displacement/Time+0 (+0 as it goes through origin)
V=s/t

Bit of calculus: dV/dt (change in velocity over time which is the gradient(accleration))= -s/t^2 (units of -s/t^2, which the units are m/s^2, oh wait meter per second sqaured is accleration so this proves accleration is the gradient)

Vt=s
Velocity*Time= Displacement which is the area under a velocity time graph as your doing y*x ======proof velocity(m/s)*time(s)= m/s * s = meters
10. I did
11. Did anyone get 620 for the question about 70mA?
12. (Original post by Dylanuk16)
Did anyone get 620 for the question about 70mA?
No i think it was 6.3 because mA converts to 0.07A . Then 0.07 x 90= 6.3

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13. (Original post by Dylanuk16)
Did anyone get 620 for the question about 70mA?

(Original post by Rof74)
No i think it was 6.3 because mA converts to 0.07A . Then 0.07 x 90= 6.3

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I got the same as Rof74, because they wanted the answer in Coulombs, so you had to divide by 1000 to convert mA to A.
14. (Original post by qutae)
I thought it was too complex too. I did GPE to get 171mill joules because energy transferred = work done
Yea I also done that.
15. (Original post by qutae)
I thought it was too complex too. I did GPE to get 171mill joules because energy transferred = work done
I did that too, that was the very first question wasn't it?

The question after that where they asked what the maximum KE or GPE or whatever it was at point B, was that the same answer as the answer to part (a)?
16. (Original post by keepyourapology)
How did that exam go? Starting an unofficial mark scheme..xD Please add questions as well.
Spoiler:
Show
Q1. Static Electricity

a. What is the diagram pointing to? (1)
b. Why does the girl get positively charged as she walks across the nylon carpet? (3)
c. Why does she get a small electric shock when she touches the metal handle of the door? (2)
d. Math question.
Answer - 6.3C (0.07A * 90)

Q2. Nuclear Fission & Fusion.
a. What is the difference between a fission and fusion reaction?
b. Fill in the blanks (number of protons and neutrons)
Protons - 92
Neutrons - 143
c.
d. Graph question about correlating temperature and fusion reactions per second.
Fusion needs a high temperature to overcome repulsion between positive nuclei. The graph shows a correlation between the increase in rate of fusion reaction per second and temperature - as temperature increases, so does rate of reaction. (thank you to L0st45!)

Q3. Half Life (I think)
a. Half life of Iodine-131.
b. Estimate half life of Iodine-131 8 days ago.
c. Why do hospital staff have increased risks from handling Iodine-131?
d. Name some precautions taken to prevent being affected by Iodine-131.
e. What emitter is used for paper rollers?
f. How does this system work?
The beta roller passes through the paper and the detector keeps a track on how many beta particles pass through. If the paper is too thick, beta count drops and the detector sends a signal to reduce pressure on the paper. If the paper is too thin, beta count is too high and the detector sends a signal to increase pressure on the paper.

Q4. Rollercoaster Question
a. 2.37 million/1.71 million
b. 1.71 million.
c. Energy transfer when the rollercoaster moves from C to D.
GPE to Kinetic Energy, as it loses its GPE as it moves downward and according to conservation of energy, it changes to kinetic energy.
d.
e.

Q5. Volts Question
a. Draw the voltmeter.
b. 12 Volts can be written as :
Answer - 12 Joules per coulomb.
c. Prove that the resistance is 11 ohms.
d.
e. Six marker on filament lamp.

Q6. Acceleration
a. Acceleration of the graph.
b. Draw the graph for a cyclist with a smaller acceleration.
c. Why does the cyclist need to keep pedaling?
Answer- To overcome air resistance and maintain the same velocity.

I came up with a potential idea of what the mark scheme could look like for some of the missing answers in this "unofficial markscheme". (These are just my own thoughts, not necessarily right!)

Q1
b)The insulating soles of the girl’s shoes rub against the nylon carpet (1)
Electrons are transferred (1)
From the girl to the carpet (1)

c) Two from:
Metal is a conductor (1)
Charge flows (from girl) to the conductor (1)
For an easy route to the ground (1)

Q3
c)
Beta and gamma are ionising radiation (1)
If they enter the body, they could collide with (molecules of) genetic material / DNA (1)
This could cause cell mutations (1)
Which may lead to tissue damage / cancer (1)

Q5 c) the resistance was 10.8 ohms, which is about 11 ohms
17. One of the questions on the roller coaster one was something like: 'What would the maximum kinetic energy of the roller coaster be between point C and D?' I said 0 because its velocity was 0, and there's a formula to work out KE using velocity. So,anything multiplied by 0 would obviously get 0.
18. What did you guys tick for the question on current and voltage I ticked decrease decrease so c

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19. (Original post by Penguin_S)
What did you guys tick for the question on current and voltage I ticked decrease decrease so c

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what was the question?
20. Question 3 (c) about hospital staff, I don't know if what I put was right, but I said: "Beta particles and gamma rays can mutate DNA causing cancer."

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