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Edexcel iGCSE Physics Paper 2 watch

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    Add your answers and any unofficial markschemes


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    For the kinetic energy question I got 154.91...
    What did you guys get?


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    (Original post by thestudentr00m)
    For the kinetic energy question I got 154.91...
    What did you guys get?


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    I got that too
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    What did you get for the reason the speed is much less when the rain particle hits the ground? (Last Q)


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    1. a) Scalar was mass b) acceleration was the vector c) Answer was B (forces on ball)
    2. a) http://www.excelatphysics.com/upload...67/8566701.jpg
    b) Using wire to show shape of magnetic field - use iron filings and plotting compasses?
    b) Relay - 1,6,3,5,2,4
    c)Why lamp turns off - circuit broken, iron core demagnetised, armature no longer attracted, contacts separate...
    3. a) Water particles when heated - gain kinetic energy - vibrate and move around...
    b) Structure of water particles vs steam particles - fairly fixed positions vs spaced out and free to move around.
    c) Can of water inverted: Sudden temperature decrease, pressure directly proportional to temperature, internal pressure decreases, atmospheric pressure is greater, causing can to collapse/become crushed.
    4. a)Balloon on cloth question - Cloth loses electrons, and cloth becomes positively charged??
    b)Danger of charge building up - explosion can occur
    c) Earthing the fuel tank removes danger
    d) Granules separate due to like charges repelling.
    5. a) 20Hz-20kHz (hearing range)
    b)Microphone (apparatus)
    c)Setup - Microphone to oscilloscope, appropriate time setting used, whistle is blown, recording taken, time for one waveform calculated, frequency = 1/t??
    d) Redraw waveform with smaller amplitude, but double the frequency.
    6) A question about radioactivity - graph - 85-95 years half-life.
    b) Why shouldn't an isotope with a short half-life be used for generating electricity in Saturn? It would've decayed by the time it got there, rendering it useless..
    7. a) 0.000308 kg m/s
    b) 0.42J??
    c)0.42J
    d)1/2mv^2
    e)154.91 or something ≈ 150 m/s
    f) External forces such as air resistance/drag and friction oppose weight force, causing energy to be lost to the surroundings as heat and sound??

    I don't remember the whole of questions 2 and 6
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    (Original post by thestudentr00m)
    What did you get for the reason the speed is much less when the rain particle hits the ground? (Last Q)


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    I said that some of the energy was lost as sound and it may have been windy so there was air resistance causing the drop to decelerate .
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    (Original post by thestudentr00m)
    For the kinetic energy question I got 154.91...
    What did you guys get?


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    I got the same
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    (Original post by sivthasan)
    1. a) Scalar was mass b) acceleration was the vector c) Answer was B (forces on ball)
    2. a) http://www.excelatphysics.com/upload...67/8566701.jpg
    b) Relay - 1,6,3,5,2,4
    c)Why lamp turns off - circuit broken, iron core demagnetised, armature no longer attracted, contacts separate...
    3. a) Water particles when heated - gain kinetic energy - vibrate and move around...
    b) Structure of water particles vs steam particles - fairly fixed positions vs spaced out and free to move around.
    c) Can of water inverted: Sudden temperature decrease, pressure directly proportional to temperature, internal pressure decreases, atmospheric pressure is greater, causing can to collapse/become crushed.
    4. a)Balloon on cloth question - Cloth loses electrons, and cloth becomes positively charged??
    b)Danger of charge building up - explosion can occur
    c) Earthing the fuel tank removes danger
    d) Granules separate due to like charges repelling.
    5. a) 20Hz-20kHz (hearing range)
    b)Microphone (apparatus)
    c)Setup - Microphone to oscilloscope, appropriate time setting used, whistle is blown, recording taken, time for one waveform calculated??
    d) Redraw waveform with smaller amplitude, but double the frequency.
    6) A question about radioactivity - graph - 90 years half life?.....
    7. a) 0.000308 kg m/s
    b) 0.42J??
    c)0.42J
    d)1/2mv^2
    e)154.91 or something ≈ 150 m/s
    f) External forces such as air resistance/drag and friction oppose weight force, causing energy to be lost to the surroundings as heat and sound??

    I don't remember the whole of questions 2 and 6
    Thank you that's so helpful!!


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    (Original post by arielynjoan)
    I said that some of the energy was lost as sound and it may have been windy so there was air resistance causing the drop to decelerate .
    Why didn't I think of it being lost as sound? Ugh

    Decent paper though.
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    When redrawing the wave, did you guys draw 6 waves as it was double the frequency?


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    (Original post by thestudentr00m)
    Thank you that's so helpful!!


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    No problem
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    What did you write for the method to find a magnetic field when there is a current?


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    (Original post by thestudentr00m)
    What did you write for the method to find a magnetic field when there is a current?


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    right hand grip
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    (Original post by thestudentr00m)
    What did you write for the method to find a magnetic field when there is a current?


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    Iron filings on the card, tap the card to align the filings.
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    (Original post by Sonechka)
    Why didn't I think of it being lost as sound? Ugh

    Decent paper though.
    I put it as some being lost as heat from friction with air. Don't know if that is too far fetched though.
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    (Original post by Hari1241)
    Iron filings on the card, tap the card to align the filings.
    Could you also put the plotting compass method?
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    Who got half life of 92.5?
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    I think your answer to find the frequency is wrong, its more the calculations than thesetup I think

    1)Find the period-ie time taken for one complete wave
    2)Count squares between 2 consecutive peaks
    3)Use F=1/P to find frequency
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    (Original post by JMR2017)
    I put it as some being lost as heat from friction with air. Don't know if that is too far fetched though.
    Well energy always seems to be lost as heat in these energy transfer questions so you might get something!

    I can't believe that was the last physics exam of my life :O kind of sad tbh
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    (Original post by thestudentr00m)
    What did you write for the method to find a magnetic field when there is a current?


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    Place iron filings on the paper and if they move towards the wire then there's a magnetic field.
 
 
 
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