Machines B/C

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Re: Machines B/C

Post by Creationist127 » October 6th, 2019, 3:56 pm

Flyingfish wrote:
October 6th, 2019, 3:09 pm
Has anyone ordered the Ward's Science machines kit that's linked on the soinc.org page? It's around $135, but I can't seem to find any information on the contents of the kit. The same kit is listed for both simple machines and compound machines, which makes it seem more likely that it might contain just like examples of each simple machine rather than materials to build a lever. Does anyone have any information on what's included in the kit?
I have no idea what’s in the kit, so the following is my opinion:
Sweet mother of Isaac Newton! That’s expensive!
Unfortunately, I have not started building yet, but the plan I have drawn up will probably cost me no more than ten bucks. I would suggest that you’re better off finding your own materials.
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Re: Machines B/C

Post by Unome » October 6th, 2019, 3:58 pm

Creationist127 wrote:
October 6th, 2019, 3:56 pm
Flyingfish wrote:
October 6th, 2019, 3:09 pm
Has anyone ordered the Ward's Science machines kit that's linked on the soinc.org page? It's around $135, but I can't seem to find any information on the contents of the kit. The same kit is listed for both simple machines and compound machines, which makes it seem more likely that it might contain just like examples of each simple machine rather than materials to build a lever. Does anyone have any information on what's included in the kit?
I have no idea what’s in the kit, so the following is my opinion:
Sweet mother of Isaac Newton! That’s expensive!
Unfortunately, I have not started building yet, but the plan I have drawn up will probably cost me no more than ten bucks. I would suggest that you’re better off finding your own materials.
Conventional wisdom holds that the Ward's kits are overpriced and not useful. Note that I have no personal experience with this kit, however I did make a competitive B lever out of a couple of plastic cups and a ruler.
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Re: Machines B/C

Post by Alex-RCHS » October 6th, 2019, 7:25 pm

someone1580 wrote:
October 6th, 2019, 12:14 pm
I've started to make the graphs but the rules on data are kind of confusing.

"i. 2 points for including data spanning the possible mass ranges"

How would you collect data from the specific masses?
Check the Machines section of the NCSO website for an example of what will be considered an acceptable graph (not on there yet, but coming soon bc I'm busy w/ college lol)
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Re: Machines B/C

Post by viditpok » October 23rd, 2019, 6:40 am

For the graph/charts, will there be a template on soinc? I am wondering as I have an invitational this weekend, but they have not posted a template on the website yet.
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Re: Machines B/C

Post by PandaShoelaces » October 25th, 2019, 8:40 am

What does "class 1 lever connected directly in series to a class 2 or 3 lever" mean?

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Re: Machines B/C

Post by Creationist127 » October 25th, 2019, 7:21 pm

PandaShoelaces wrote:
October 25th, 2019, 8:40 am
What does "class 1 lever connected directly in series to a class 2 or 3 lever" mean?
Basically, make two levers attached so that when one moves, the other moves as well.
A class one lever has the fulcrum between the two forces on the lever, and class two and three levers have the two forces on the same side of the fulcrum.
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Re: Machines B/C

Post by masterkite » November 6th, 2019, 12:26 pm

Hello guys, did anyone here go to the Texas invitational? If so, what were the ratios for the weights for division B and how was it run? :D

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Re: Machines B/C

Post by misha » November 6th, 2019, 12:46 pm

Does anyone know if the ratios for the lab portion of machines have to be in decimals or not. If so up to what decimal place does the ratio have to be at.

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Re: Machines B/C

Post by AwesomeSauceis1 » November 6th, 2019, 9:05 pm

misha wrote:
November 6th, 2019, 12:46 pm
Does anyone know if the ratios for the lab portion of machines have to be in decimals or not. If so up to what decimal place does the ratio have to be at.

https://www.soinc.org/how-accurate-must ... lace-two-0
(Section: 2 / Paragraph: e / Line: 6)
10/29/2019
HOW ACCURATE MUST THE MEASUREMENT OF THE RATIO BE (SHOULD THE ANSWER BE ONLY A WHOLE NUMBER, ONE DECIMAL PLACE, TWO DECIMAL PLACES, ETC.)?
Students may give their answer to any number of decimal places. Their answer will be compared to the ES's calculation of the ratio, which will be calculated by using the maximal precision of the scales and observing rules of significant figures.

In regards to the precision, the rules say Masses A, B, and C must be between 20.0 and 800.0 g. That's 3/4 significant figures, so I would use 3 to try to line it up with the key. Of course, follow any instructions explicitly given by the ES.
Last edited by AwesomeSauceis1 on November 7th, 2019, 9:22 pm, edited 1 time in total.
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Re: Machines B/C

Post by adarsh » November 7th, 2019, 2:50 am

Since I feel the rules are vague on this, what is one example of two data variables for the chart?

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