Simple Machines B/Compound Machines C

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Simple Machines B/Compound Machines C

Postby Jim_R » August 4th, 2013, 3:47 pm

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Re: Simple Machines B/Compound Machines C

Postby Mathdino » September 5th, 2013, 1:18 am

So now that a few of you have gotten the rules already, can anyone give a general description of the event? Not looking for specifics but what's the general idea of the event and what's the competition like?
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Re: Simple Machines B/Compound Machines C

Postby JTMess » September 6th, 2013, 8:09 pm

Mathdino wrote:So now that a few of you have gotten the rules already, can anyone give a general description of the event? Not looking for specifics but what's the general idea of the event and what's the competition like?


Two part event

First part is test on simple and compound machines.

Second part involves building a compound lever (class one and class two lever in series if I'm remembering correctly) and using a known mass to estimate an unknown mass as quickly as possible using your lever device.
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Re: Simple Machines B/Compound Machines C

Postby chalker » September 7th, 2013, 5:51 am

FYI, we tried to model this event after the Optics event that rotated out a couple years ago. For the physical portion of it there is a distinct tradeoff between how fast you measure and how accurate you are with regards to points.

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Re: Simple Machines B/Compound Machines C

Postby The Architect » September 8th, 2013, 1:53 pm

What would an example of a dishonest attempt to utilize a compound lever be?
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Re: Simple Machines B/Compound Machines C

Postby hscmom » September 8th, 2013, 4:12 pm

The Architect wrote:What would an example of a dishonest attempt to utilize a compound lever be?


Hitting the supervisor over the head with it? Not sure. I guess if you are being dishonest, you'll know it. Important Scioly People, what WOULD a dishonest use be?
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Re: Simple Machines B/Compound Machines C

Postby chalker » September 8th, 2013, 4:16 pm

The Architect wrote:What would an example of a dishonest attempt to utilize a compound lever be?


Unofficially as always, the reason we put that language in was 2 fold:

1. Prevent students from just guesstimating the unknown mass in an attempt to get a really low time score. We saw this issue in the first year of optics, where a reasonable strategy was to just plop a mirror down as fast as possible with no measurements or calculations at all.

2. Prevent students from using a simple lever (our designing their compound lever to in reality be a simple lever

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Re: Simple Machines B/Compound Machines C

Postby awesome90220 » September 10th, 2013, 5:01 pm

Correct me if im wrong, but the test about the simple/compound machines is just about calculations, correct?
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Re: Simple Machines B/Compound Machines C

Postby chalker » September 11th, 2013, 6:35 am

awesome90220 wrote:Correct me if im wrong, but the test about the simple/compound machines is just about calculations, correct?


No. The rules explicitly indicate that it will include concepts, calculations, and history questions.

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Re: Simple Machines B/Compound Machines C

Postby chalker » September 11th, 2013, 6:50 am

Thought I'd post a quick analysis of the tradeoff between speed and accuracy for the device testing portion. Note you shouldn't forget that the written test is worth half the overall score - so don't focus all your time on your device.

Time score: 1 sec = 0.08333 pts
Mass score: 1% difference between actual mass and your calculated value = 0.3 pts

Put another way, each additional 1% improvement in your calculation should take you ~3.6 seconds.

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Re: Simple Machines B/Compound Machines C

Postby Flavorflav » September 20th, 2013, 5:24 am

A question for those who may know more about this topic than I do: if questions are limited to static equilibrium per 4.a.iii, how could they involve kinetic energy as suggested in 4.a.ii?

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Re: Simple Machines B/Compound Machines C

Postby CEOArchAngel » October 13th, 2013, 3:06 pm

Does anyone know the formulas needed for Compound Machine this year?

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Re: Simple Machines B/Compound Machines C

Postby tle990 » October 17th, 2013, 3:46 pm

I can't seem to find any practice tests for Simple Machines. Am I looking in the wrong place? Thanks!

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Re: Simple Machines B/Compound Machines C

Postby chalker » October 17th, 2013, 4:04 pm

tle990 wrote:I can't seem to find any practice tests for Simple Machines. Am I looking in the wrong place? Thanks!


It's a brand new event this year, thus there isn't likely to be any practice tests yet. Why don't you take a stab at making one yourself and sharing with everyone via the test exchange?

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Re: Simple Machines B/Compound Machines C

Postby ahoback » October 17th, 2013, 6:29 pm

PLTW has some great rudimentary resources concerning simple machines, there are several links below...

http://www.mnps.org/AssetFactory.aspx?did=63816

http://www.wilsonsd.org/cms/lib01/PA01000270/Centricity/Domain/228/A1_1_2SimpleMachinesPracticeProblems.pdf


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