Simple Machines B/Compound Machines C Question Marathon

Test your knowledge of various Science Olympiad events
Jim_R
Admin Emeritus
Admin Emeritus
Posts: 283
Joined: Sun May 13, 2001 11:22 pm
Division: Grad
Location: Pittsburgh, Pa
Contact:

Simple Machines B/Compound Machines C Question Marathon

Postby Jim_R » Thu Aug 29, 2013 3:15 am

-The path of the Administrator is beset on all sides by the inequities of the selfish and the tyranny of evil men.

-Nothing\'s gonna get deleted. We\'re gonna be like three little Fonzies here. And what\'s Fonzie like? Come on, what\'s Fonzie like?
-Cool?
-Correctamundo. And that\'s what we\'re gonna be. We\'re gonna be cool. Now, I\'m gonna count to three, and when I count three, you let go of your mouse, and back away from the keyboard. But when you do it, you do it cool. Ready? One... two... three.

AstroRockShock
Member
Member
Posts: 0
Joined: Sun Oct 13, 2013 7:28 pm
Division: Grad
State: FL
Contact:

Re: Simple Machines B/Compound Machines C Question Marathon

Postby AstroRockShock » Tue Oct 15, 2013 2:45 am

I suppose this will be the first question, let's start off easy:
(Make sure to hide your answer)
What are the 6 classical simple machines?

fantasyfan
Member
Member
Posts: 69
Joined: Sun Feb 19, 2012 3:19 am
Division: C
State: NY
Location: Ward Melville/The Shire/Nerdfighteria/Hyperion
Contact:

Re: Simple Machines B/Compound Machines C Question Marathon

Postby fantasyfan » Tue Oct 15, 2013 2:48 am

Lever, inclined plane, wedge, screw, pulley, wheel and axle
Looking forward to anatomy, protein, fossils, and optics (NYS trial) this year!

AstroRockShock
Member
Member
Posts: 0
Joined: Sun Oct 13, 2013 7:28 pm
Division: Grad
State: FL
Contact:

Re: Simple Machines B/Compound Machines C Question Marathon

Postby AstroRockShock » Tue Oct 15, 2013 2:55 am

fantasyfan wrote:Lever, inclined plane, wedge, screw, pulley, wheel and axle

That's all correct!
Your turn to ask a question!

fantasyfan
Member
Member
Posts: 69
Joined: Sun Feb 19, 2012 3:19 am
Division: C
State: NY
Location: Ward Melville/The Shire/Nerdfighteria/Hyperion
Contact:

Re: Simple Machines B/Compound Machines C Question Marathon

Postby fantasyfan » Tue Oct 15, 2013 3:03 am

Yay
Obscure history reference, I Choose You!!!
Don't worry it isn't too hard

Which famous mathematician identified five of the six classical machines (no inclined plane:() In his book Mechanics
Looking forward to anatomy, protein, fossils, and optics (NYS trial) this year!

AstroRockShock
Member
Member
Posts: 0
Joined: Sun Oct 13, 2013 7:28 pm
Division: Grad
State: FL
Contact:

Re: Simple Machines B/Compound Machines C Question Marathon

Postby AstroRockShock » Tue Oct 15, 2013 11:50 pm

fantasyfan wrote:Yay
Obscure history reference, I Choose You!!!
Don't worry it isn't too hard

Which famous mathematician identified five of the six classical machines (no inclined plane:() In his book Mechanics


This is what I found...
Hero (or Heron) of Alexandria

fantasyfan
Member
Member
Posts: 69
Joined: Sun Feb 19, 2012 3:19 am
Division: C
State: NY
Location: Ward Melville/The Shire/Nerdfighteria/Hyperion
Contact:

Re: Simple Machines B/Compound Machines C Question Marathon

Postby fantasyfan » Wed Oct 16, 2013 2:35 am

AstroRockShock wrote:
fantasyfan wrote:Yay
Obscure history reference, I Choose You!!!
Don't worry it isn't too hard

Which famous mathematician identified five of the six classical machines (no inclined plane:() In his book Mechanics


This is what I found...
Hero (or Heron) of Alexandria


Correct your turn
Looking forward to anatomy, protein, fossils, and optics (NYS trial) this year!

AstroRockShock
Member
Member
Posts: 0
Joined: Sun Oct 13, 2013 7:28 pm
Division: Grad
State: FL
Contact:

Re: Simple Machines B/Compound Machines C Question Marathon

Postby AstroRockShock » Thu Oct 17, 2013 12:13 am

Give 2 examples of a first class (type 1) lever.

TheAnav
Member
Member
Posts: 0
Joined: Thu Oct 17, 2013 1:23 am
Division: C
State: WA
Contact:

Re: Simple Machines B/Compound Machines C Question Marathon

Postby TheAnav » Thu Oct 17, 2013 1:25 am

AstroRockShock wrote:Give 2 examples of a first class (type 1) lever.

Not too hard :)
Seesaws, and crowbars!

AstroRockShock
Member
Member
Posts: 0
Joined: Sun Oct 13, 2013 7:28 pm
Division: Grad
State: FL
Contact:

Re: Simple Machines B/Compound Machines C Question Marathon

Postby AstroRockShock » Thu Oct 17, 2013 11:38 pm

TheAnav wrote:
AstroRockShock wrote:Give 2 examples of a first class (type 1) lever.

Not too hard :)
Seesaws, and crowbars!


Correct!
Your turn!

User avatar
Mathdino
Member
Member
Posts: 24
Joined: Fri Sep 21, 2012 8:46 pm
Division: C
State: NV
Location: Middle of the Desert
Contact:

Re: Simple Machines B/Compound Machines C Question Marathon

Postby Mathdino » Sun Oct 20, 2013 7:12 pm

Here's a IMA question
Suppose that the pulley in the below image is connected to something weighing 10 kg, and I need to pull on it with 9 N of force to hold it up. What's the efficiency? Image
"If, in other sciences, we are to arrive at certainty without doubt, and truth without error, it behooves us to place the foundations of knowledge in mathematics."
-Roger Bacon, The Opus Major of Roger Bacon

lchs
Member
Member
Posts: 19
Joined: Fri Mar 02, 2012 12:36 am
Division: C
State: TX
Contact:

Re: Simple Machines B/Compound Machines C Question Marathon

Postby lchs » Mon Oct 21, 2013 1:47 am

Mathdino wrote:
Here's a IMA question
Suppose that the pulley in the below image is connected to something weighing 10 kg, and I need to pull on it with 9 N of force to hold it up. What's the efficiency? Image


I'm not so sure about this but I'll give it a shot...

Answer
IMA = (Force out of the machine)/(Force into the machine).
So for this scenario, the Force into the machine would be 9N, I think. And the Force out of the machine would be 10kg * 9.8m/s/s = 98N.
Therefore, the IMA = 98N/9N = 10.89?
I feel like I need to use the visual somehow, but this is what I ended up doing... :?

User avatar
chinesesushi
Member
Member
Posts: 258
Joined: Tue Sep 17, 2013 11:57 pm
Division: C
State: CA
Contact:

Re: Simple Machines B/Compound Machines C Question Marathon

Postby chinesesushi » Mon Oct 21, 2013 3:22 am

lchs wrote:
Mathdino wrote:
Here's a IMA question
Suppose that the pulley in the below image is connected to something weighing 10 kg, and I need to pull on it with 9 N of force to hold it up. What's the efficiency? Image


I'm not so sure about this but I'll give it a shot...

Answer
IMA = (Force out of the machine)/(Force into the machine).
So for this scenario, the Force into the machine would be 9N, I think. And the Force out of the machine would be 10kg * 9.8m/s/s = 98N.
Therefore, the IMA = 98N/9N = 10.89?
I feel like I need to use the visual somehow, but this is what I ended up doing... :?


But I believe Mathdino is asking for the efficiency in the problem, not the IMA?

idk though...
1.36
Never argue with an idiot, they will drag you down to their level and then beat you with experience.
Before you criticize a man, walk a mile in his shoes. That way you'll be a mile away and he'll be shoeless.
You should only create problems, that only you know solutions to.

User avatar
Mathdino
Member
Member
Posts: 24
Joined: Fri Sep 21, 2012 8:46 pm
Division: C
State: NV
Location: Middle of the Desert
Contact:

Re: Simple Machines B/Compound Machines C Question Marathon

Postby Mathdino » Mon Oct 21, 2013 7:54 am

chinesesushi wrote:
lchs wrote:I'm not so sure about this but I'll give it a shot...

Answer
IMA = (Force out of the machine)/(Force into the machine).
So for this scenario, the Force into the machine would be 9N, I think. And the Force out of the machine would be 10kg * 9.8m/s/s = 98N.
Therefore, the IMA = 98N/9N = 10.89?
I feel like I need to use the visual somehow, but this is what I ended up doing... :?


But I believe Mathdino is asking for the efficiency in the problem, not the IMA?

idk though...
1.36

Almost
The AMA is the (force out)/(force in), not IMA; lchs got the AMA correctly. Efficiency is AMA/IMA. chinesesushi almost got it, but I assume you got the IMA as 8 instead of 16. Notice that there are 4 class 2 pulleys and 2 class 1 pulleys, and 1*1*2*2*2*2=16. Efficiency is 10.89/16, or about 68.06%.
Edit: A simpler way to explain it is that the IMA of the pulley on the right is 4 (count the rope sections) and the IMA of the one on the right is 4 (count). 4*4=16.

Your turn, chinesesushi.
Edit: I derped and got a slightly wrong answer the first time. Fixed.
Last edited by Mathdino on Fri Dec 27, 2013 7:38 am, edited 1 time in total.
"If, in other sciences, we are to arrive at certainty without doubt, and truth without error, it behooves us to place the foundations of knowledge in mathematics."
-Roger Bacon, The Opus Major of Roger Bacon

User avatar
chinesesushi
Member
Member
Posts: 258
Joined: Tue Sep 17, 2013 11:57 pm
Division: C
State: CA
Contact:

Re: Simple Machines B/Compound Machines C Question Marathon

Postby chinesesushi » Mon Oct 21, 2013 6:56 pm

Mathdino wrote:
chinesesushi wrote:But I believe Mathdino is asking for the efficiency in the problem, not the IMA?

idk though...
1.36

Almost
The AMA is the (force out)/(force in), not IMA; lchs got the AMA correctly. Efficiency is AMA/IMA. chinesesushi almost got it, but I assume you got the IMA as 8 instead of 16. Notice that there are 4 class 2 pulleys and 2 class 1 pulleys, and 1*1*2*2*2*2=16. Efficiency is 10.36/16, or about 64.75%.
Edit: A simpler way to explain it is that the IMA of the pulley on the right is 4 (count the rope sections) and the IMA of the one on the right is 4 (count). 4*4=16.

Your turn, chinesesushi.


Yeah, I was trying to figure out why the efficiency was greater than 1.

machine
Image What is the IMA of the pulley system and how much force is required to lift it the appropriate amount. The pulley is in an ideal state.
Never argue with an idiot, they will drag you down to their level and then beat you with experience.
Before you criticize a man, walk a mile in his shoes. That way you'll be a mile away and he'll be shoeless.
You should only create problems, that only you know solutions to.


Return to “2014 Question Marathons”

Who is online

Users browsing this forum: No registered users and 1 guest