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March 30, 2024, 02:09:50 am

Author Topic: Bozo's queries  (Read 15163 times)  Share 

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Bozo

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Re: Bozo's queries
« Reply #15 on: June 04, 2011, 09:12:47 pm »
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Does anyone know anything about using pre transposed formulae in the exam. If anyone is going to the TSFX lecture tomorrow could they find out. Because for e.g i came across a 3 mark question the other day for banked corners. And i had a pre transposed formula for it which was a simple sub in and bang the answer. I just want to make sure i don't get penalised for not putting enough working out.

cohen

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Re: Bozo's queries
« Reply #16 on: June 04, 2011, 09:16:30 pm »
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If you don't mind me asking, what's the pre-transposed formula? ^.^
My teacher said it'll be ok, but If i get a chance tomorrow at lunch, or during the breaks, I'll ask the lecturers :)

onur369

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Re: Bozo's queries
« Reply #17 on: June 04, 2011, 09:18:17 pm »
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im guessing its sqroot(radius x gravity tan(theta))
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Whatlol

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Re: Bozo's queries
« Reply #18 on: June 04, 2011, 09:45:13 pm »
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Does anyone know anything about using pre transposed formulae in the exam. If anyone is going to the TSFX lecture tomorrow could they find out. Because for e.g i came across a 3 mark question the other day for banked corners. And i had a pre transposed formula for it which was a simple sub in and bang the answer. I just want to make sure i don't get penalised for not putting enough working out.

yes that  should be allowed ,and  as quoted from the vcaa examiners report :
 "The required angle was 5.70.
There were a number of correct ways students answered this question. Some students had a standard formula involving
tanθ on their A4 sheets. Others did vector diagrams with weight, normal and resultant centripetal force to form a rightangled
triangle " 

So i think that implies it is acceptable. But if your  really concerned just do the vector diagram its not too hard and you can even just write it on your cheat sheet if your worried.
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Vincezor

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Re: Bozo's queries
« Reply #19 on: June 04, 2011, 09:59:22 pm »
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Does anyone know anything about using pre transposed formulae in the exam. If anyone is going to the TSFX lecture tomorrow could they find out. Because for e.g i came across a 3 mark question the other day for banked corners. And i had a pre transposed formula for it which was a simple sub in and bang the answer. I just want to make sure i don't get penalised for not putting enough working out.

I personally would only use a pre-transposed formula to check my final answer (not including gravity :P). I'm not sure what would happen if you used a pre-transposed formula and got the answer wrong though... 0/3? :S
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Bozo

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Re: Bozo's queries
« Reply #20 on: June 04, 2011, 10:43:07 pm »
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Yeah but, these pre transposed formulae, if allowed will save HEAPSS OF TIME! So whoever goes tomorrow please find out.

cohen

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Re: Bozo's queries
« Reply #21 on: June 04, 2011, 10:52:31 pm »
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Are there any other questions that you would like me (or anyone else that is going tomorrow) to ask?

Bozo

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Re: Bozo's queries
« Reply #22 on: June 04, 2011, 11:18:06 pm »
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Ask specifically about sig figs?

Bozo

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Re: Bozo's queries
« Reply #23 on: June 05, 2011, 12:29:32 am »
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Yeah, i don't get it. At first i was trying trig etc, but it doesn't seem to work out.

examsman

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Re: Bozo's queries
« Reply #24 on: June 05, 2011, 10:42:16 am »
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I've got it.

The answer is C?

You have to use torques about ankle. Thus finding the force that is perpendicular to the foot from the normal reaction force of the toe. then, you find the perpendicular force acting at the heel, and use trig to find tension in the achilles.

If you want further explanation ring me or come my house later today.

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Bozo

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Re: Bozo's queries
« Reply #25 on: June 05, 2011, 12:52:44 pm »
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Alright i'll give you a buzz later.

cohen

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Re: Bozo's queries
« Reply #26 on: June 05, 2011, 08:03:24 pm »
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Ok, i got back an hour ago or so, and here's what geoff said at the start

1) You are able to use pre-transposed formulae (He even gave us a list of some projectile motion formulae, and energy per unit volume equations)
2) Significant figures don't matter that much in Physics, but try and stay within the least amount of numbers that you use in your calculations.

Do you want me to make a thread with all of the pre-transposed formulae that we were given, and the ones i got from my teacher? (My teacher has given me quite a few of these formulas ^.^)

jinny1

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Re: Bozo's queries
« Reply #27 on: June 05, 2011, 08:31:06 pm »
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Ok, i got back an hour ago or so, and here's what geoff said at the start

1) You are able to use pre-transposed formulae (He even gave us a list of some projectile motion formulae, and energy per unit volume equations)
2) Significant figures don't matter that much in Physics, but try and stay within the least amount of numbers that you use in your calculations.

Do you want me to make a thread with all of the pre-transposed formulae that we were given, and the ones i got from my teacher? (My teacher has given me quite a few of these formulas ^.^)

yes please! :)
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xZero

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Re: Bozo's queries
« Reply #28 on: June 05, 2011, 08:46:05 pm »
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I remember the examiner's report stated that most student who used pre-transposed formulas gets the question wrong one way or another so personally I'm against it. It's alright if you use it to check your final solution but it shouldn't be your only working out
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Bozo

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Re: Bozo's queries
« Reply #29 on: June 06, 2011, 11:55:38 am »
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Yeah they got it wrong for a projectile question most likely, because those formulas only apply to symmetrical projectiles.