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!! Physics HL LC '16 - Predictions, guesses, discussion, etc.

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    #32
    TomDelahunt
    Registered Users Posts: 99 ✭✭TomDelahunt


    The electricity questions around the variation of current with potential difference of a metallic conductor is based around Ohms's law i think? 2013 had this as Q4 its ploting v to I with R being a constant.


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    #33
    TSMGUY
    Closed Accounts Posts: 855 ✭✭✭TSMGUY


    chitting bricks for physics.


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    #34
    TooMuchWork
    Registered Users Posts: 118 ✭✭TooMuchWork


    TSMGUY wrote: »
    chitting bricks for physics.

    I've disregarded it for the past two weeks so I could deal with other exams and it feels like I'm starting from day 1.


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    #35
    TSMGUY
    Closed Accounts Posts: 855 ✭✭✭TSMGUY


    TooMuchWork wrote: »
    I've disregarded it for the past two weeks so I could deal with other exams and it feels like I'm starting from day 1.
    lol this!

    Looking at mechanics like "what's gravity?????"

    Seriously in trouble, and I have to study econ. The questions in the book are too easy, the exam questions are so much more abstract.


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    #36
    TooMuchWork
    Registered Users Posts: 118 ✭✭TooMuchWork


    TSMGUY wrote: »
    lol this!

    Looking at mechanics like "what's gravity?????"

    Seriously in trouble, and I have to study econ. The questions in the book are too easy, the exam questions are so much more abstract.

    Me too! Haven't looked at that since the last time I studied physics, and I only started it in March! Hoping elasticity, oligopoly/perfect comp, labour/land come up, otherwise I'll be waffling a few Macro questions.

    Doesn't help I'm working this weekend!!!


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    #37
    legocrazy505
    Closed Accounts Posts: 691 ✭✭✭legocrazy505


    Am I the only one who opens up my notes and can recall most of it having not looked at it in weeks? Physics was an amazing subject the past two years. Really helped that our teacher seemed pretty interested in it himself and he'd try and get us to do every experiment ourselves/in groups to help us remember them.


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    #38
    TSMGUY
    Closed Accounts Posts: 855 ✭✭✭TSMGUY


    legocrazy505 wrote: »
    Am I the only one who opens up my notes and can recall most of it having not looked at it in weeks?
    Yes, yes you are :D


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    #39
    Jdoe
    Registered Users Posts: 39 ✭Jdoe


    Is it possible to leave out electricity and just know enough to answer q5 ?


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    #40
    alaandocs
    Registered Users Posts: 33 ✭alaandocs


    Jdoe wrote: »
    Is it possible to leave out electricity and just know enough to answer q5 ?

    It's risky. Either a definition, small calculation or a concept question would be asked.


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    #41
    Jdoe
    Registered Users Posts: 39 ✭Jdoe


    alaandocs wrote: »
    It's risky. Either a definition, small calculation or a concept question would be asked.

    Sorry I probably didn't phrase my question the best, I meant is it possible to only study enough of the electricity chapter not to do any long questions on it and just know enough to cover the small questions on electricity in Q5?


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    #42
    TooMuchWork
    Registered Users Posts: 118 ✭✭TooMuchWork


    Jdoe wrote: »
    Sorry I probably didn't phrase my question the best, I meant is it possible to only study enough of the electricity chapter not to do any long questions on it and just know enough to cover the small questions on electricity in Q5?

    Yeah, though electricity tends to be pretty easily marked and questions are repetitive and easy.


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    #43
    adam240610
    Registered Users Posts: 814 ✭✭✭adam240610


    https://quizlet.com/adam_judge/folders/physics/flashcards

    I made these flashcards of the vast majority of possible shortquestions and definitions on the course throughout the year, I'm sure they will be very useful for study so close to the exams now.


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    #44
    reason vs religion
    Closed Accounts Posts: 346 ✭✭reason vs religion


    Nice work! There are seven base SI units, though :p


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    #45
    adam240610
    Registered Users Posts: 814 ✭✭✭adam240610


    I made all of them besides the mechanics section* hahaha


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    #46
    TSMGUY
    Closed Accounts Posts: 855 ✭✭✭TSMGUY


    adam240610 wrote: »
    https://quizlet.com/adam_judge/folders/physics/flashcards

    I made these flashcards of the vast majority of possible shortquestions and definitions on the course throughout the year, I'm sure they will be very useful for study so close to the exams now.

    I don't deserve to get whatever grade you get! Really great work.


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    #47
    adam240610
    Registered Users Posts: 814 ✭✭✭adam240610


    TSMGUY wrote: »
    I don't deserve to get whatever grade you get! Really great work.

    I. Love. Physics.
    Be damned if I don't get an A1.


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    #48
    TomDelahunt
    Registered Users Posts: 99 ✭✭TomDelahunt


    adam240610 wrote: »
    I. Love. Physics.
    Be damned if I don't get an A1.

    Yeahp its a brilliant Card set! cheers for the link!


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    #49
    alaandocs
    Registered Users Posts: 33 ✭alaandocs


    reason vs religion wrote: »
    Nice work! There are seven base SI units, though :p

    Correct but there isn't even a mention of candelas in the book except in the glossary so no need for it.


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    #50
    adam240610
    Registered Users Posts: 814 ✭✭✭adam240610


    alaandocs wrote: »
    Correct but there isn't even a mention of candelas in the book except in the glossary so no need for it.

    They mention a lot of stuff that we don't need to know though, like quantum spin.
    Although with the sec Hawking radiation will probably come up...


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    #51
    alaandocs
    Registered Users Posts: 33 ✭alaandocs


    adam240610 wrote: »
    They mention a lot of stuff that we don't need to know though, like quantum spin.
    Although with the sec Hawking radiation will probably come up...

    Very true, classic sec. In fairness the course is just made easier by the exclusion of calculus which doesn't help if you go to 3rd level and do it.
    I suppose the whole course just goes over a lot of things and doesn't go into to much depth which doesn't help also.


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    #52
    adam240610
    Registered Users Posts: 814 ✭✭✭adam240610


    alaandocs wrote: »
    Very true, classic sec. In fairness the course is just made easier by the exclusion of calculus which doesn't help if you go to 3rd level and do it.
    I suppose the whole course just goes over a lot of things and doesn't go into to much depth which doesn't help also.

    Yeah, applied maths is as close as you can n get in LC, hopefully I can do a module on it next year, would be very interesting.


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    #53
    TomDelahunt
    Registered Users Posts: 99 ✭✭TomDelahunt


    Anybody know any pages that have the names of the scientists we need to know?


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    #54
    Seaaan
    Registered Users Posts: 626 ✭✭✭Seaaan


    I'm so scared or not getting an A1 in this, so far these exams haven't been great and I want theoretical physics Trinity :o

    Any of ye hoping for theoretical?


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    #55
    sd97
    Registered Users Posts: 7 ✭sd97


    Can anyone explain to me how to describe the mechanical experiments like a~f and conservation of momentum using timing gates and a scaler timer please?


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    #56
    TomDelahunt
    Registered Users Posts: 99 ✭✭TomDelahunt


    We use air track and datalogger method but i will describe it anyway!
    For A ~ F ---- you set up using only 1 air rider connected to a scale pan via a pulley at the end of the track. The rider in both experiments has a card length of L attached to it. As the rider goes through gate 1 the time initial velocity is found as the card passes through the beam. The System will find this value. Then the same happens as the rider goes through gate 2 which is S meters away. The second gate will give us the value for V final velocity. We can then use V* = U* +2AS to find A. This is done multiple times by adding weight to the scale pan and each time recorded.

    For Momentum ---- 2 riders are needed on the air track. One of the riders needs to be between the two gates. As the lone rider passes through gate 1 we have it's initial velocity. The initial velocity of the rider 2 is 0. Final velocity for both is equal. When rider 1 comes in contact with rider 2 they will move off together (you need to show a way for them to stick together e.g Velcro or blue-tack) their final velocities are calculated by the data logger as the pair move through gate 2. then use the conservation of momentum and they should equal "provided no external force act on the bodies"
    Hope this helps mate!


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    #57
    Misty_01
    Registered Users Posts: 27 ✭Misty_01


    Leaving cert HL 2011 Q6 c) explanation please ??? How is friction towards the left and why does the child remain stationery????? Thanks !


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    #58
    adam240610
    Registered Users Posts: 814 ✭✭✭adam240610


    Seaaan wrote: »
    I'm so scared or not getting an A1 in this, so far these exams haven't been great and I want theoretical physics Trinity :o

    Any of ye hoping for theoretical?

    Was thinking of it but decided on engineering, don't want to be confined to very specific jobs.

    How did the mock go?


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    #59
    adam240610
    Registered Users Posts: 814 ✭✭✭adam240610


    Misty_01 wrote: »
    Leaving cert HL 2011 Q6 c) explanation please ??? How is friction towards the left and why does the child remain stationery????? Thanks !

    It says a flat disk, so the friction is just pointing towards the centre of the the circle. It can go to the left or right it doesn't matter.

    The child remains stationary as there is no friction between him and the merry go round, like if you put the child one ice and spun it, he wouldn't move with the ice. Its a stupid question.


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    #60
    TSMGUY
    Closed Accounts Posts: 855 ✭✭✭TSMGUY


    adam240610 wrote: »
    It says a flat disk, so the friction is just pointing towards the centre of the the circle. It can go to the left or right it doesn't matter.

    The child remains stationary as there is no friction between him and the merry go round, like if you put the child one ice and spun it, he wouldn't move with the ice. Its a stupid question.
    Could you help me with this? http://www.boards.ie/vbulletin/showthread.php?t=2057611411


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    #61
    adam240610
    Registered Users Posts: 814 ✭✭✭adam240610


    TSMGUY wrote: »
    Could you help me with this? http://www.boards.ie/vbulletin/showthread.php?t=2057611411

    Can you pm me a picture of it? I don't have a calculator but I'm sure I can help.


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