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    (Original post by jackwalters132)
    The refracted ray in the glass semi-circle diagram, it refracted along the boundary (along the base of the semi circle) as the incidence angle was at critical angle. Who else did the same?
    Same here, did you draw the ray going left or right? I did it going left... D:
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    I did the right, did you draw an arrow?
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    Does anyone have a copy of the p2 paper? or a mark scheme?
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    (Original post by rachaeldoran)
    Does anyone have a copy of the p2 paper? or a mark scheme?
    Not yet, they probably will by tomorrow
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    (Original post by rachaeldoran)
    Does anyone have a copy of the p2 paper? or a mark scheme?
    No one will, only very few teachers will have one if they took a spare paper from the exam hall.

    They're online for only teachers to see in a few days I think, I think it's a week.
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    (Original post by Azim101)
    So literally I just wrote Nucleus and Protrin mass =1 and electron is 1/1840 and I said the nucleus is protons and neutrons and I said thee electrons orbit the nucleus. And I said the charges that's it. 6/6?
    I did that and added at the last minute that the nucleus is small and there is lots of empty space
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    (Original post by cogito.)
    Complete work solution:

    80/2^n = 10
    2^n = 80/10 = 8
    n = log 8/log 2 = 3

    half life = 36/3 = 12
    Q.E.D
    it's not that deep; all i did was 80-->40-->20-->10
    counted that it was 3 jumps and did 36 divided by 3 but at least i know i can do logrithms
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    Physics unit 2 unofficial mark scheme.

    Circuits.
    Line C would have the greatest resistance because it has the shallower line on the graph so it has the most resistance. (2 marks).

    Drawing a resistor - Just a rectangle with dashes on both ends. (1 mark)

    Drawing a voltmeter - Voltmeter must be parallel in the circuit, so connected parallel in a circle with a "V" inside. (1 mark)

    Units for resistance? Ohms.(1 mark)

    Charge question. Charge = 51 unit = Coulombs (2 marks)

    Half life

    There was 3 H.L from 80g to 10g (80 to 40 to 20 to 10) so 36/3 = 12 years, even though I messed this up in my paper oh well. (2 marks).

    Speed-distance time graph.Speed = distance/time = 175/10 = 1.75m/s (2 marks)

    Breaking distance

    What's breaking distance?Braking distance is the distance a vehicle will travel from the point when its brakes are fully applied to when it comes to a complete halt. (1 mark)

    Factor effecting braking distance (1 mark)
    -Conditions of the road.-Weather conditions

    Fusion and fission.

    What's fission?(1 mark)

    Splitting of nuclei.

    What's sub atomic particle starts the reaction? (1 mark)

    Neutron.

    Why does repulsion force exist? (2 marks)

    Repulsion force why does it exist, because the nucleus has lots of protons which repel each other and like charges have repulsion.

    Where does fusion naturally occur? (1 mark)

    Stars.

    two advantages for fusion. (2 marks)
    -Doesn't produce nuclear waste.
    -Materials needed for fusion are easily extracted so cheaper costs

    .6 marker question:
    -Protons and neutrons found in nucleus.
    -Electrons found in electron shells.
    -Protons have mass of 1 and charge of +1.
    -neutrons have mass of 1 and charge of 0.
    -electrons have charge of -1 and mass negligible.

    Rutherford and his naughty plum pudding questions.

    Charge is positive. (1 mark)

    Why did his version not stick? (2 marks)

    Because experiments showed alpha particles refracting, reflecting and some went through so the diagram didn't prove his theory and hence why they had to change it.

    Why did scientists think their results were valid? (1 mark)

    Because it was repeated 100,000 times.

    Momentum

    What is meant by law of momentum? (1 or 2 marks?)

    Total momentum before equals total momentum after collision.

    Seatbelt (4 marks)

    Reduces impact time so increases the time for momentum to change, therefore decreasing the total momentum force and hence the impact would be less severe.

    Momentum (4 marks)

    p=m*vp= 5m/s

    KE and GPE

    E = m * v^2 * 1/2
    E = 50g * 12^2 * 0.5
    E= 3600 J (2 marks)

    Maximum gravitation potential energy (1 mark)

    3600 J or your answer to part (a) despite it being wrong.

    Maximum height (3 marks)

    E = m * g * h
    3600 = 0.05 * 10 * h
    3600 = 0.5 * h
    3600/0.5 = 7200m

    Tick the graph (1 mark)

    Graph B.

    Trend of graph (2 marks)

    Angle 45 and less the range increases. But > 45 the range decreases.
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    (Original post by dons178)
    Physics unit 2 unofficial mark scheme.

    Circuits.
    Line C would have the greatest resistance because it has the shallower line on the graph so it has the most resistance. (2 marks).

    Drawing a resistor - Just a rectangle with dashes on both ends. (1 mark)

    Drawing a voltmeter - Voltmeter must be parallel in the circuit, so connected parallel in a circle with a "V" inside. (1 mark)

    Units for resistance? Ohms.(1 mark)

    Charge question. Charge = 51 unit = Coulombs (2 marks)

    Half life

    There was 3 H.L from 80g to 10g (80 to 40 to 20 to 10) so 36/3 = 12 years, even though I messed this up in my paper oh well. (2 marks).

    Speed-distance time graph.Speed = distance/time = 175/10 = 1.75m/s (2 marks)

    Breaking distance

    What's breaking distance?Braking distance is the distance a vehicle will travel from the point when its brakes are fully applied to when it comes to a complete halt. (1 mark)

    Factor effecting braking distance (1 mark)
    -Conditions of the road.-Weather conditions

    Fusion and fission.

    What's fission?(1 mark)

    Splitting of nuclei.

    What's sub atomic particle starts the reaction? (1 mark)

    Neutron.

    Why does repulsion force exist? (2 marks)

    Repulsion force why does it exist, because the nucleus has lots of protons which repel each other and like charges have repulsion.

    Where does fusion naturally occur? (1 mark)

    Stars.

    two advantages for fusion. (2 marks)
    -Doesn't produce nuclear waste.
    -Materials needed for fusion are easily extracted so cheaper costs

    .6 marker question:
    -Protons and neutrons found in nucleus.
    -Electrons found in electron shells.
    -Protons have mass of 1 and charge of +1.
    -neutrons have mass of 1 and charge of 0.
    -electrons have charge of -1 and mass negligible.

    Rutherford and his naughty plum pudding questions.

    Charge is positive. (1 mark)

    Why did his version not stick? (2 marks)

    Because experiments showed alpha particles refracting, reflecting and some went through so the diagram didn't prove his theory and hence why they had to change it.

    Why did scientists think their results were valid? (1 mark)

    Because it was repeated 100,000 times.

    Momentum

    What is meant by law of momentum? (1 or 2 marks?)

    Total momentum before equals total momentum after collision.

    Seatbelt (4 marks)

    Reduces impact time so increases the time for momentum to change, therefore decreasing the total momentum force and hence the impact would be less severe.

    Momentum (4 marks)

    p=m*vp= 5m/s

    KE and GPE

    E = m * v^2 * 1/2
    E = 50g * 12^2 * 0.5
    E= 3600 J (2 marks)

    Maximum gravitation potential energy (1 mark)

    3600 J or your answer to part (a) despite it being wrong.

    Maximum height (3 marks)

    E = m * g * h
    3600 = 0.05 * 10 * h
    3600 = 0.5 * h
    3600/0.5 = 7200m

    Tick the graph (1 mark)

    Graph B.

    Trend of graph (2 marks)

    Angle 45 and less the range increases. But > 45 the range decreases.
    You are wrong on the ke gpe and maximum height questions
    Mass is measured in kg not g
    Oh no you've lost 7marks
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    Ok, so apparently in the P3 paper there was a question where you had to draw a Ray diagram. Like an idiot I didn't see it so I must have missed that whole page. Does anyone know how many marks I missed out on because of that page?
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    (Original post by harryffc)
    you are wrong on the ke gpe and maximum height questions
    mass is measured in kg not g
    oh no you've lost 7marks
    you cant even lift a finger with 3 joules
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    Who else did really bad on the P2 paper
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    (Original post by ibrahim24)
    hmm I think I did quite good in the 6 markers for c2+3 (Cant say the same for biology), but I found the 1/2 markers harder in chem? wbu?

    That's how i felt it wasn't a bad paper but some of the 1 markers were,harder
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    Exactly, it was 3600 j

    (Original post by Ed Jeffrey)
    you cant even lift a finger with 3 joules
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    (Original post by Moko15)
    Ok, so apparently in the P3 paper there was a question where you had to draw a Ray diagram. Like an idiot I didn't see it so I must have missed that whole page. Does anyone know how many marks I missed out on because of that page?
    I did further additional and it wasn't in there, it must have been in the triple science physics paper
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    (Original post by jamestg)
    Same here, did you draw the ray going left or right? I did it going left... D:
    it had to be right cos it was refracting idk what you did :l
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    (Original post by Hollie1903)
    I did further additional and it wasn't in there, it must have been in the triple science physics paper
    umm i think it was 3 marks dw that was a really difficult diagram so i hopei got it :l
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    (Original post by Ankit.B)
    umm i think it was 3 marks dw that was a really difficult diagram so i hopei got it :l
    Did you do triple science? It definitely wasn't in my exam paper
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    Does anyone remember the rocket calcs?
    Energy = 1/2 * 0.05 * 144 = 3.6J right?????

    And height was 3.6/10*0.05 = 7.2 metres ??

    Also velocity increased or decreased?
    Mass was also in kg so it must be correct.
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    (Original post by Dabiri)
    Isn't it meant to be 1.25?
    Ye i put 1.25 but herd some people put 0.25
 
 
 
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