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Re: Simple Machines B/Compound Machines C
Posted: March 1st, 2014, 7:23 pm
by chinesesushi
Atomicbob11 wrote:Question for the building part of Compound Machines (C)
Does the Unknown Mass have to be larger than the known mass? Or can it be a greater or lesser value? Just because In the rules when it states the ratio must be 1:12, or 1:16, or 1:20, I assumed that means the smaller mass must always be known because I thought they explained it that it was known to unknown mass? But I could be wrong.
Can I get some clarification on this?
Thanks
I have had it both ways.
Re: Simple Machines B/Compound Machines C
Posted: March 2nd, 2014, 2:51 pm
by BSchiffer
For division C Compound Machines, most of the practice problems I can find online are just ideal/actual mechanical advantage. What are types of problems that would require load, effort, potential/kinetic energy, or coefficient of friction? What and how much should we know about these topics?
Re: Simple Machines B/Compound Machines C
Posted: March 2nd, 2014, 2:59 pm
by chinesesushi
BSchiffer wrote:For division C Compound Machines, most of the practice problems I can find online are just ideal/actual mechanical advantage. What are types of problems that would require load, effort, potential/kinetic energy, or coefficient of friction? What and how much should we know about these topics?
Many. For example, the test may give you a complex series of simple machines connected in series with each other and give you an effort to find load. I suggest you review practice tests that your coach might have from invitationals, or remember problems from regional competitions.
Re: Simple Machines B/Compound Machines C
Posted: March 2nd, 2014, 3:54 pm
by BSchiffer
chinesesushi wrote:BSchiffer wrote:
For division C Compound Machines, most of the practice problems I can find online are just ideal/actual mechanical advantage. What are types of problems that would require load, effort, potential/kinetic energy, or coefficient of friction? What and how much should we know about these topics?
Many. For example, the test may give you a complex series of simple machines connected in series with each other and give you an effort to find load. I suggest you review practice tests that your coach might have from invitationals, or remember problems from regional competitions.
Could you give me an example of such a problem? My school is very relaxed about science olympiad, we don't do any invitationals, and there is only one practice test online. Is there a place I could get problems (and solutions) such as this?
Re: Simple Machines B/Compound Machines C
Posted: March 2nd, 2014, 6:56 pm
by SWAnG
If you have a test, you could do some test exchanges with other schools (if the test you have is allowed to be exchanged in the first place)
Re: Simple Machines B/Compound Machines C
Posted: March 2nd, 2014, 8:52 pm
by phil9047
Sciolapedia wrote:So I have a question
I don't know where to study for simple machines because the tests at the invites have been SO much harder than what there is to study. My question is where can I study for this event that is just as challenging as the real tests? I haven't found anything like the invite tests online and the resources for studying are just repeating simple things like AMA ima efficiency etc. Everything is more simple than the actual test. That wasn't a pun.
Help much appreciated.
Thanks
I think if you learn AP Physics Mechanics, you should be very well off for Compound Machines, let alone Simple Machines. But I'm in Div. B, so maybe someone in C correct me if I'm wrong. Although AMA and IMA aren't really in Physics, physics allows you to understand, rather than memorize a bunch of formulas like a headless chicken, and AMA/IMA should come naturally.
Learning physics takes pretty long, but I think it's definitely worth it.
Re: Simple Machines B/Compound Machines C
Posted: March 4th, 2014, 2:39 pm
by Unome
phil9047 wrote:Sciolapedia wrote:So I have a question
I don't know where to study for simple machines because the tests at the invites have been SO much harder than what there is to study. My question is where can I study for this event that is just as challenging as the real tests? I haven't found anything like the invite tests online and the resources for studying are just repeating simple things like AMA ima efficiency etc. Everything is more simple than the actual test. That wasn't a pun.
Help much appreciated.
Thanks
I think if you learn AP Physics Mechanics, you should be very well off for Compound Machines, let alone Simple Machines. But I'm in Div. B, so maybe someone in C correct me if I'm wrong. Although AMA and IMA aren't really in Physics, physics allows you to understand, rather than memorize a bunch of formulas like a headless chicken, and AMA/IMA should come naturally.
Learning physics takes pretty long, but I think it's definitely worth it.
Nice statement. At the last invitational me and my partner got a perfect score on the test, but just today we took a test that we probably all scored less than a 50% on
. There's always more to learn.
Re: Simple Machines B/Compound Machines C
Posted: March 4th, 2014, 4:28 pm
by phil9047
Can you give examples of difficult problems, cuz so far, all the practice problems I've had are pretty straightforward?
It's probably because I'm in division B.
Re: Simple Machines B/Compound Machines C
Posted: March 5th, 2014, 12:14 pm
by hscmom
[quote="Unome
just today we took a test that we probably all scored less than a 50% on
. There's always more to learn.[/quote]
Could you pass on the link to that hard test? We're also struggling to find more challenging material.
Thanks!
Re: Simple Machines B/Compound Machines C
Posted: March 5th, 2014, 5:47 pm
by FenderBender87
What is the mathematical equation you can use to solve for the unknown mass using the known mass? How can you figure it out? I couldn't seem to find any pattern in my tests... Any help would be greatly appreciated.