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September 27, 2025, 10:29:05 pm
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Author Topic: Questions 15-17 Mid-Year 2010!!!  (Read 3286 times)  Share 

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a.zirek

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Questions 15-17 Mid-Year 2010!!!
« on: June 08, 2010, 10:29:22 pm »
For questions 15-17 I got ABB
What did you guys get?
My teachers been telling me it's AAA but I still stand by my result.
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2009: Further - 49 (raw) |Turkish - 45 (raw)

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Akirus

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Re: Questions 15-17 Mid-Year 2010!!!
« Reply #1 on: June 08, 2010, 10:30:41 pm »
ABB is correct.

Momentum is not lost as the spring compresses.
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Stormer

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Re: Questions 15-17 Mid-Year 2010!!!
« Reply #2 on: June 08, 2010, 10:30:51 pm »
ABB. Momentum is always conserved, during and throughout.
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ks04

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Re: Questions 15-17 Mid-Year 2010!!!
« Reply #3 on: June 08, 2010, 10:34:09 pm »
yup, definatly ABB
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Ball Lightning

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Re: Questions 15-17 Mid-Year 2010!!!
« Reply #4 on: June 08, 2010, 10:35:04 pm »
Its ABB
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Akirus

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Re: Questions 15-17 Mid-Year 2010!!!
« Reply #5 on: June 08, 2010, 10:35:47 pm »
These threads make me question the quality of the teachers in some schools =/
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kyzoo

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Re: Questions 15-17 Mid-Year 2010!!!
« Reply #6 on: June 08, 2010, 10:37:18 pm »
ABB.

I was confused between whether to choose A and B for 16 and 17, because i was thinking that the two trolleys would lose speed temporarily. But then I saw the word "System" and that sealed it.
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2009
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2010
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2010 ATAR: 99.90
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m@tty

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Re: Questions 15-17 Mid-Year 2010!!!
« Reply #7 on: June 08, 2010, 10:37:49 pm »
Yeah, as if you're teacher is saying that ...
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KRISTOFFA

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Re: Questions 15-17 Mid-Year 2010!!!
« Reply #8 on: June 08, 2010, 10:44:03 pm »
I said AAC :/
Why was the last one B though?
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Stormer

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Re: Questions 15-17 Mid-Year 2010!!!
« Reply #9 on: June 08, 2010, 10:44:47 pm »
It said momentum not kinetic energy. I had C initally aswell.
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KRISTOFFA

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Re: Questions 15-17 Mid-Year 2010!!!
« Reply #10 on: June 08, 2010, 11:16:43 pm »
I know, but why is momentum conserved in the spring? Wouldn't you think that they would both slow down, therefore have a smaller momentum while the spring is being compressed?
I'm not saying that I'm right, I'm fairly sure that I'm wrong, this is just my reasoning.
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2009: Further maths (38).

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kyzoo

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Re: Questions 15-17 Mid-Year 2010!!!
« Reply #11 on: June 08, 2010, 11:29:10 pm »
Because the conservation of momentum is derived off Newton's third law. F(A) = -F(B). As long as the objects exert equal and opposite action-reaction forces on each other, and these are the only forces acting on the objects (an isolated system) then momentum will be conserved.
« Last Edit: June 08, 2010, 11:35:32 pm by kyzoo »
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2009
~ Methods (Non-CAS) [48 --> 49.4]

2010
~ Spesh [50 --> 51.6]
~ Physics [50 --> 50]
~ Chem [43 --> 46.5]
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~ UMEP Maths [5.0]

2010 ATAR: 99.90
Aggregate 206.8

NOTE: PLEASE CONTACT ME ON EMAIL - [email protected] if you are looking for a swift reply.

olly_s15

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Re: Questions 15-17 Mid-Year 2010!!!
« Reply #12 on: June 08, 2010, 11:31:23 pm »
Quote from: KRISTOFFA on June 08, 2010, 11:16:43 pm
I know, but why is momentum conserved in the spring? Wouldn't you think that they would both slow down, therefore have a smaller momentum while the spring is being compressed?
I'm not saying that I'm right, I'm fairly sure that I'm wrong, this is just my reasoning.

sounds logical
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taiga

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Re: Questions 15-17 Mid-Year 2010!!!
« Reply #13 on: June 08, 2010, 11:39:00 pm »
Momentum should be conserved no matter what in that kind of situation. So ABB
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olly_s15

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Re: Questions 15-17 Mid-Year 2010!!!
« Reply #14 on: June 08, 2010, 11:39:31 pm »
Quote from: taigastyle on June 08, 2010, 11:39:00 pm
Momentum should be conserved no matter what in that kind of situation. So ABB

i agree but wtf happens to the momentum whilst the spring compresses?
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