Unit 3 Physics exam 2010 review
By Heath McGregor on Jun 8, 2010 in VCE Exams, VCE Physics
Hi all,
By now, you should have finished the Unit 3 VCE Physics exam for 2010. What did you think of the paper? What was hard? What was easy? How do you think you went?
Let us know your thoughts and comments below (please keep them clean!)…cheers
(5 votes, average: 3.00 out of 5)
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Brendan | Jun 8, 2010 | Reply
i found it ridiculosly hard, compared to previous years. i was stumped for the whole section of motion and eventually just guessed the anwers, attempting to answer every question even if it was wrong
Tom | Jun 8, 2010 | Reply
Overall, it wasnt to bad.
Quite long.
Only marks I knew I missed were the second part of the helpictoper question.
Will I lose marks for saying the gain of the amp question was 50, rather than -50? (assuming thats the answer)
pheesix | Jun 8, 2010 | Reply
physics was harder than last year , but not too bad
Aaron | Jun 8, 2010 | Reply
i found it relatively easy but longer than the past exams.
Ben | Jun 8, 2010 | Reply
5.71 degrees i think is the angle to the banked curve
Ben | Jun 8, 2010 | Reply
The answer to the amp question is 50
voltage gain is always positive
Ketchup | Jun 8, 2010 | Reply
Ben – VCAA would prefer gain to be written as a positive ratio (just look at past paper) however you would not loose marks if you put it down as negative (as long as it’s an inverting amplifier)
Tom – Angles in physics should always be written to only 1 decimal place. Remember you don’t loose marks if you are only 1 significant figure off the answer
Mer | Jun 8, 2010 | Reply
I thought the exam was long. Not really sure how I went.Tom don’t stress because the question asked for gain and gain is always positive.
Mer | Jun 8, 2010 | Reply
Oh and can anyone tell me what the correct responses were for the questions relating to 2 trolleys colliding with a spring on the front of the 1st trolley?. It was multiple choice of graphs and then explanations.
Chris | Jun 8, 2010 | Reply
i messed up the light globe question forgot about the parrallel arrangement! im so depressed, what do you think the cut off will be for A+?? not like last year i hope!!
!!!
Chris | Jun 8, 2010 | Reply
isnt voltage gain negative if the amplifier is inverting?
Chris | Jun 8, 2010 | Reply
the answer was A B B
Joy | Jun 8, 2010 | Reply
I found the exam slightly harder than last year’s exam. Overall it wasn’t terrible. The question that I struggled on were the last question in electronics(create a circuit). By the way what was the gain for the amplifier question. I got something like 200.
Ben | Jun 8, 2010 | Reply
when will solutions be available?
Matt | Jun 8, 2010 | Reply
Voltage gain is always positive, its like a magnitude.
monisha | Jun 8, 2010 | Reply
hey joy don’t want to depress you or anything the gain was 50 not 200. anyways i found the exam to be like a 48km marathon it went on and on and on….. doest any one know the answer to the helicopter question the horizontal distance?
mPhysics | Jun 8, 2010 | Reply
I put the trolley answers as A, A, A since the v decreases during spring compression so shouldn’t the p decrease momentarily?
mPhysics | Jun 8, 2010 | Reply
And I totally missed Q5 about labelling the bike. Just didn’t see it!
alice | Jun 8, 2010 | Reply
@mphysics-
momentum is always conserved regardless of whether collisions are elastic or not.
But that was a long and harder than usual paper. I found that the electronics questions weren’t as straightforward as usual ):
Was the answer to question 1b) 1.0 J or 0.8 J??
dean | Jun 8, 2010 | Reply
the answer to the helicopter one was 63m something
Tom | Jun 8, 2010 | Reply
I got 63 something as well for the first part of the helcopter question. Didnt have time to complete it though.
al | Jun 8, 2010 | Reply
it wasn’t too hard, if I got enough time to finish it! it’s about twice as long as the past year exam!!
SmartPhysicsGuy | Jun 8, 2010 | Reply
I’m going to clarify some answers i remember. The trolley questions were A (kinetic energy was lost then regained), B (momemtum never changes in an elastic system), C (only graph which loses kinetic energy, which is and inelastic system),
Q 1) was around 28.3 ms and the acceleration was 16 ms
Q 2) from memory the acceleration was 2.5 ms and the energy was 1 joule
Q 3) had the weight and normal force labelled and angle was something like 6.9 or 7
someone should post solutions to the exam and what was the cut off for an A+ last year?
Soheil | Jun 8, 2010 | Reply
I didn’t know how to do any of the questions. Everything was too hard to access for me, i should of listened to my teachers and stayed back 2 years.
Tee | Jun 8, 2010 | Reply
I thought you needed mass to get the angle of the cycling track??? maybe i missed something. Anyone else get 3 b’s in a row for the question involving spring collision between two trolleys?
Brendan | Jun 8, 2010 | Reply
there is a list of solutions on a different site (itute), however im not sure if they are 100% correct
Craig | Jun 8, 2010 | Reply
I found it a little longer than the practice ones, completely ran out of time only just finishing motion and most of electronics. Guessed most of the detailed study at the end.
@monisha: I worked it out and feel confident, but cant remember it. Just worked out the time for the vertical and use that to get the X of the horizontal.
Ben | Jun 8, 2010 | Reply
Smartphysicsguy you are wring about the third motion multiple choice question
it asked what will the graph of MOMENTUM be if the collision is inelastic. Momentum is always consered regardless of loss of energy hence the answer was B not C
Also I’m pretty sure that the angle of the bankd curve was 5.71 degrees as stated by itute
SmartPhysicsGuy | Jun 8, 2010 | Reply
Ben: your correct my mistake haha. Also question 3) on itute says 2.0 ms, can someone clarify, because W=mg which is W=(0.1)(10) which = 1N. Then F=ma on 0.4kg mass and you get 2.25ms. ???
Benson | Jun 8, 2010 | Reply
Today’s physics was damn easy, easier than further maths and i had never seen such straight foward questions before… guys.. refer to my answer:
1. a= 2ms
Monisha: the horizontal distance for where the hikers should stand is around 63m+10-10
to Others,
if there is any enquiries about any answers you want, please mention the question here and i will give you the 1000% accurate answer!
Ben | Jun 8, 2010 | Reply
Yeh SmartPhysics guy that also was worrying for me. Also its 2.5ms^-2 not 2.25.
If you treat it as 1N acting on the total 0.5kg mass then you get 2ms but i dno y you would do that
StupidPhysicsGuy | Jun 8, 2010 | Reply
Hey SmartPhysicsGuy….how come ur answer is all different than mine????
mediator | Jun 9, 2010 | Reply
Hey monisha, you’re an arrogant slut
SmartPhysicsGuy | Jun 9, 2010 | Reply
is it because the acceleration of the moving objects has a combined mass of 0.5kg? that would be why i guess. And how do they give consequential errors on this exam? for example the pulley system question?
miki | Jun 9, 2010 | Reply
XD i did the same
but it wasnt extremely hard
Briana | Jun 9, 2010 | Reply
Lol for the voltage gain I got 33.3 … And I got 1.0 J of work, which I thought was weird. Other people in my class used Ek = mv^2 and got a totally different answer.
katherine | Jun 9, 2010 | Reply
what distance did people get for the plane one?
Ace | Jun 9, 2010 | Reply
Relating to consequential marks, is it full marks for like a second part of the question if you do all the working out and formulas right, but you use the wrong calculated acceleration, such as the pulley system.
also, with the LDR i wrote the information regarding to v out decreasing (that second part), but i accidentally wrote increasing.
so, whats going to happen? ;D
Ace | Jun 9, 2010 | Reply
sorry i meant v out increasing i explained, but i wrote v out decreases as my final answer *
will i get some marks?
Sarah | Jun 9, 2010 | Reply
i got 33.33 aswell for voltage gain. How did you guys get 50?
Rebekah | Jun 9, 2010 | Reply
I believe actually that you aren’t meant to give ‘gain’ a positive or negative sign. I was told quite clearly that it was just the value (magnitude) and in some of the past exams I did before the actual exam the negative sign was omitted.
neonlights99 | Jun 9, 2010 | Reply
The one with the trolleys is A (kinetic energy is converted into elastic potential energy during the collision, but is then converted back into kinetic energy, as the collision was elastic), B (The Law of Conservation of Momentum states that momentum is conserved. Graph C depicts a loss of momentum during the collision which breaks the LoCoM), B (same as previous answer).
For the question with the pulley and two masses, you should take the two masses as one system with a total mass of 0.5kg, because the 1N acting down (weight of the 0.1kg mass) is acting upon both of the masses together, not seperately. So it should have been a = F/m = 1/0.5 = 2ms^-2.
For gain, in past exams, the answer given in the solutions is positive, but they indicate that negative gain was also accepted.
I believe the gain for the amplifier was 50. you should take the (change in Vout)/(change in Vin). However, due to the clipping, this might have been a little tricky. I remember that my friend who got a gain of 33.33 took the correct values of Vout (which would be the two values where the output signals clipped), but didn’t take the corresponding values of Vin. Instead, he took the max and min values of Vin, which did not correspond to the values of Vout that he took…
Rah! | Jun 10, 2010 | Reply
No. Voltage gain has to be positive.
NA23 | Jun 10, 2010 | Reply
hey does anyone have the 2010 unit 3 physics exam or knows where to find it?
it’s kinda depressing looking at the paper not under exam conditions, but it’d be much appreciated.
as for the amplifier qs, im not sure if i read the units correct, was it millivolts for Vin or Vout or no? Can’t remember now
Sandra | Jun 10, 2010 | Reply
How did you guys do the banking question? cause I got 45 degrees. I just did tan theta is equal to the centripetal acceleration which was 1.
The pulleys one I had no clue whatsoever. I’m happy with the way I went and soo glad its over.
lolo | Jun 10, 2010 | Reply
What was with the first 2 questions of the electronics? Does anyone know the answers and can you explain how you got it please. Cheers
John | Jun 10, 2010 | Reply
I messed up the spring constant q, messed up the second electronics question and completely forgot to come back and draw the circuit.
Bye bye, 45+ ….
Zara | Jun 18, 2010 | Reply
difficult, difficult, difficult. Were did these questions come from?
hobart | Jun 20, 2010 | Reply
the gain was -50 but it didnt ask for magnitude, so the answer could have been 50 or -50
Anuj | Jun 23, 2010 | Reply
man the exam was so freakin long. i just coodnt finish on time
sev | Aug 2, 2010 | Reply
Hi guys just found out i got 70% for physics exam – it that really bad?? Im a bit worried. What did anyone else get, just want to compare.
thanks.
Leah | Aug 2, 2010 | Reply
Well I got a B. I’m pretty sure that’d be a B as well.
Sandra | Aug 3, 2010 | Reply
I got a C and I’m really upset cause i worked my butt off and put in tonnes of work and yet I got the lowest mark in my entire year level. I don’t understand how I could’ve gone so bad cause I was really confident and I knew what I was doing. I’m realy dreading the end of the year. I’ll probably end up repeating year 12. This sucks!
Le | Aug 3, 2010 | Reply
Sandra, to make you happy, i got a D… which is the lowest mark in my class! I don’t know what happened to me in the exam i totally flopped it… Does that mean i should repeat year 12 too? :/ VERY DEPRESSED!
Better than you | Aug 7, 2010 | Reply
sucked in all i got an a+
it was an easy exam, i finished with half an hour to spare
george | Aug 29, 2010 | Reply
- i got an a+ as well, u dont need 2 rub it in2 ppls faces
michael | Oct 6, 2010 | Reply
is it true if you get a C in the exam that you can’t get over 30 for your study score??
ranjith | Nov 15, 2010 | Reply
i got a c and got a study score of 39
jimmy | Nov 29, 2010 | Reply
Hey ranjith you serious?
I just don’t my hopes raised and then crushed but if your right then im gonna be a happy hopeful man.
let me know aiight.
cheers