Physics HL 2010 Predictions?

Blerdiii · 19-06-2010 11:47pm

tracker-man wrote: »

I'll put a fiver(virtual fiver like :P ) with all boards.ie members that the physics paper will be no different from previous years. Stop worrying about the log tables!

So, any solid predictions?

harmonics and all that jazz on a stretched string !

greenbetty69 · 20-06-2010 12:05am

i think wer gonna see reationship between acceleration and force cause i dont think thats come up yet.. but then again, whos knows!

straight_As · 20-06-2010 11:17am

Is it alright to derive the equations of motion using calculus for the LC? It just seems a lot more logical and less memory work so it could be handy seeing as we're gonna be getting so many of these derivations (apparently).

Like is this ok for s = ut + 1/2(at^2)

let v = u + at .... u and are constant

ds/dt = u + at

ds = u.dt + at.dt

(integral)ds = (integral)u.dt + (integral)at.dt

s = ut + (1/2)at^2 + C

s = 0 when t = 0

=> C = 0

=> s = ut + .5 at^2

Would they accept that?

trepasers · 20-06-2010 11:51am

I was just wondering what do solutions on examinations.ie mean by this e.g.....define magnetic flux φ = BA and notation......whats the notation ??

20-06-2010 12:18pm

You have to explain what the symbols mean.

And yeah, I think you can use calculus to derive the formulae.

Maybe_Memories · 20-06-2010 5:45pm

straight_As wrote: »

Is it alright to derive the equations of motion using calculus for the LC? It just seems a lot more logical and less memory work so it could be handy seeing as we're gonna be getting so many of these derivations (apparently).

Like is this ok for s = ut + 1/2(at^2)

let v = u + at .... u and are constant

ds/dt = u + at

ds = u.dt + at.dt

(integral)ds = (integral)u.dt + (integral)at.dt

s = ut + (1/2)at^2 + C

s = 0 when t = 0

=> C = 0

=> s = ut + .5 at^2

Would they accept that?

I'm actually wondering the same thing.
Although you should start with a = dv/dt and work backwards from there. You'd also have to explain every step you take because most examiners wont have seen it before.

Maybe_Memories · 20-06-2010 5:47pm

trepasers wrote: »

I was just wondering what do solutions on examinations.ie mean by this e.g.....define magnetic flux φ = BA and notation......whats the notation ??

Notation means:
φ = magnetic flux
B = magnetic flux density
A = Area

citizenerased1 · 20-06-2010 6:10pm

accordinng to my physics teacher his best student ever done derivations that way and got no marks..you gotta prove them using the laws of physics innit!:D

laws of physics and laws of maths aint the same thing (apparently :P)

Maybe_Memories · 20-06-2010 6:50pm

citizenerased1 wrote: »

accordinng to my physics teacher his best student ever done derivations that way and got no marks..you gotta prove them using the laws of physics innit!:D

laws of physics and laws of maths aint the same thing (apparently :P)

Using Calculus was probably the way Newton derived them in the first place.

It's defined in the physics book, acceleration is the rate of change of velocity with respect to time.
Basically, a = dv/dt. Work from there.
You're still using "laws of maths" the other way, you're using algebra. It should be up to you to decide which "tool" you use to do the same job.

Besides, in my book, Faraday's Law is written as E = d(phi)/dt.

20-06-2010 7:25pm

Maths & physics use the same language. You can use calculus, but it may just be safer not to just incase the marking scheme is funny.

citizenerased1 · 20-06-2010 7:36pm

I'm just saying what happened....
go one do it if you want infact i dareee ya

Blerdiii · 20-06-2010 8:16pm

Deleted User wrote: »

Maths & physics use the same language. You can use calculus, but it may just be safer not to just incase the marking scheme is funny.

completely agree , they can always alter the marking scheme to make up for how easy our lives have been made :P
better safe than sorry!

metalfest · 20-06-2010 8:28pm

Cipango wrote: »

He he glad to be of help!

that site is actually a godsend!

Aoiferz · 20-06-2010 8:39pm

Blerdiii wrote: »

completely agree , they can always alter the marking scheme to make up for how easy our lives have been made :P
better safe than sorry!

And then there'll always be an examiner who takes the marking scheme as gospel so even if you are technically right, you get no marks because its not word for word the marking scheme.

muffinz · 20-06-2010 9:32pm

right so im a bit confused. doing the variation of current with p.d, what does the graph have to be? do u put I on the Y, V on the x, or do u have to do those stupid things like putting it 1/V instead of just V etc?

Blerdiii · 20-06-2010 9:40pm

Aoiferz wrote: »

And then there'll always be an examiner who takes the marking scheme as gospel so even if you are technically right, you get no marks because its not word for word the marking scheme.

i like to imagine i have an examiner like some people i know have been, see you are an a1 student and leave off some slips to help you XD
( and yes i do know examiners who have done that )

Chuchoter · 20-06-2010 9:51pm

In the interests of not having to make a whole new thread, how hard is physics? I know thats a very subjective question, but is it like Geography where you just read the book and learn it or like maths where you actually have to understand whats going on? Because I chose it for 5th year and now I'm like omg what have I done. :P I got an A at hl maths last year for the JC, will that make it any easier?

Kersmash · 20-06-2010 9:52pm

I am so failing this tomorrow =/

greenbetty69 · 20-06-2010 9:59pm

muffinz wrote: »

right so im a bit confused. doing the variation of current with p.d, what does the graph have to be? do u put I on the Y, V on the x, or do u have to do those stupid things like putting it 1/V instead of just V etc?

for all the variation of current with p.d. the current (I) always goes on the Y axis and the p.d. goes on the X axis

slasher_65 · 20-06-2010 10:04pm

I have now given up all pretense of study. I managed to scrape a B in testing myself with the 2005 and 2007 papers, so that's what I can hope for.

Conor108 · 20-06-2010 10:11pm

22:11 Boll***s didn't realise it was that late. Shoulda done business

muffinz · 20-06-2010 10:13pm

i wanted to do economics.. but noooo i had to do physics because there were only 2 girls in the year that wanted to do economics >:[

ZorbaTehZ · 20-06-2010 10:21pm

muffinz wrote: »

right so im a bit confused. doing the variation of current with p.d, what does the graph have to be? do u put I on the Y, V on the x, or do u have to do those stupid things like putting it 1/V instead of just V etc?

You just plot P.D. against I, because V is directly proportional to I so no need to plot its inverse, and as greenbetty said you plot P.D. on the x-axis. Generally, what you are varying goes on the x-axis and what you measure goes on the y-axis,so if you can't remember in the exam just do that.

muffinz · 20-06-2010 10:23pm

ZorbaTehZ wrote: »

You just plot P.D. against I, because V is directly proportional to I so no need to plot its inverse, and as greenbetty said you plot P.D. on the x-axis. Generally, what you are varying goes on the x-axis and what you measure goes on the y-axis,so if you can't remember in the exam just do that.

thanks to both of you

Areq · 21-06-2010 12:40am

what you think , is the "laws of equlibrium for a set of coplanar forces" experiment comming up? i hate it ..

irish_man · 27-06-2010 5:13pm

Cipango wrote: »

Also the experiment on newtons second law is due.

irish_man wrote: »

i'd put money on that not coming up. if it does i think it will be asked with another question, maybe with conservation of momentum or something

i take that back
:P

Physics HL 2010 Predictions?

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