Simple Machines B/Compound Machines C

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Postby noodleluvr » April 17th, 2014, 7:20 pm

Is force decomposition necessary to know on higher level tests?
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Re: Simple Machines B/Compound Machines C

Postby Unome » April 23rd, 2014, 2:59 pm

Sciolapedia wrote:Wow how do u get it to balance that fast and put the numbers in the calculator?!

We have our ways... 8-)
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Postby Unome » April 23rd, 2014, 3:02 pm

noodleluvr wrote:Is force decomposition necessary to know on higher level tests?

Sorry for posting twice. I've never needed it, but the biggest competition I've been to is Booth Invitational, where us and the first place team both got a perfect score on the test (I've never actually seen a difficult test for Simple Machines in Science Olympiad).
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Re: Simple Machines B/Compound Machines C

Postby Sciolapedia » April 23rd, 2014, 4:34 pm

How much time does it usually take you guys to balance the lever?

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Re: Simple Machines B/Compound Machines C

Postby bzc11 » April 27th, 2014, 6:18 pm

Hi, I'm doing it at states, and my partner and I can average around 18-20 seconds.
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Re: Simple Machines B/Compound Machines C

Postby bzc11 » April 27th, 2014, 6:21 pm

Sorry for double posting, but when they say MA, do they usually tend to say IMA or AMA? Sorry if it's a stupid question. :oops:
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Re: Simple Machines B/Compound Machines C

Postby JustDroobles » April 29th, 2014, 9:08 am

bzc11 wrote:Sorry for double posting, but when they say MA, do they usually tend to say IMA or AMA? Sorry if it's a stupid question. :oops:


First of all, this could vary on the question so always use your best judgement. The normal definition of "mechanical advantage" is the measure of force amplification - so this is essentially the same as AMA, the ratio of force out to force in. However, oftentimes if they are not bothering to specify AMA or IMA they will be talking about an ideal machine, with no friction, so IMA=AMA=MA.

If your intuition fails you, these are potentially decent guidelines: If they ask you about mechanical advantage and give you distance data, use IMA. If they give you force data, use AMA. If it is a multiple choice relating to the definition, go with the force definition.

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Re: Simple Machines B/Compound Machines C

Postby Unome » May 6th, 2014, 11:02 am

bzc11 wrote:Hi, I'm doing it at states, and my partner and I can average around 18-20 seconds.

Did you medal? (I'm betting on 1-6 place for that time)
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Re: Simple Machines B/Compound Machines C

Postby Voltage » May 19th, 2014, 5:34 pm

Does anyone else feel like the Nats test for SM was too easy? That was the general consensus between my teammate and I, so I'm just wondering what the other teams thought.
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Re: Simple Machines B/Compound Machines C

Postby fantasyfan » May 19th, 2014, 5:49 pm

I did find it quite easy, but somehow I messed up on the lever trying to move very quickly, and I don't know what I did :(
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Re: Simple Machines B/Compound Machines C

Postby Algorhythmic » May 20th, 2014, 5:12 am

What kind of times were you guys getting at nationals? What was the fastest you heard of?

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Re: Simple Machines B/Compound Machines C

Postby Voltage » May 20th, 2014, 9:15 am

My team took 22 seconds and got 18th place. I dunno about the top 10, but I'm guessing 10-15 seconds... I do know that one of the proctors commented that our device was fast. However, he might have just been being nice, plus we were in one of the earlier time blocks.
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Re: Simple Machines B/Compound Machines C

Postby JonB » May 20th, 2014, 9:57 am

Algorhythmic wrote:What kind of times were you guys getting at nationals? What was the fastest you heard of?


We had 22 seconds, a weight of 1006g and 8th place overall. We are pretty certain the unknown mass was ~1000g because they used two lead ingots.

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Re: Simple Machines B/Compound Machines C

Postby Sciolapedia » May 20th, 2014, 11:46 am

I got in the 830s for my answer and got 26 seconds. My overall place was 4.

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Re: Simple Machines B/Compound Machines C

Postby SWAnG » May 20th, 2014, 12:33 pm

I am pretty sure the weight is around 1020 grams, and i got 1024 in 18 seconds. Failed the test i think, so got 13th.


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