Low IMA Pulley Task

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Low IMA Pulley Task

Postby Unome » Tue Sep 05, 2017 4:18 pm

See rule 4.b.viii for details.

A single moveable pulley would probably work, though it would need a heavy counterweight (greater than 1 kg, even without accounting for inefficiency). It could be anchored to the high IMA pulley system (one of them triggering the other).
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Re: Low IMA Pulley Task

Postby ScottMaurer19 » Tue Sep 05, 2017 6:36 pm

Unome wrote:See rule 4.b.viii for details.

A single moveable pulley would probably work, though it would need a heavy counterweight (greater than 1 kg, even without accounting for inefficiency). It could be anchored to the high IMA pulley system (one of them triggering the other).

Wouldn't that still have an IMA of 1?
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Re: Low IMA Pulley Task

Postby Unome » Tue Sep 05, 2017 6:38 pm

ScottMaurer19 wrote:
Unome wrote:See rule 4.b.viii for details.

A single moveable pulley would probably work, though it would need a heavy counterweight (greater than 1 kg, even without accounting for inefficiency). It could be anchored to the high IMA pulley system (one of them triggering the other).

Wouldn't that still have an IMA of 1?

No, half the force comes from the free rope, the other half from the anchored rope. Example
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Re: Low IMA Pulley Task

Postby ScottMaurer19 » Tue Sep 05, 2017 6:47 pm

Unome wrote:
ScottMaurer19 wrote:
Unome wrote:See rule 4.b.viii for details.

A single moveable pulley would probably work, though it would need a heavy counterweight (greater than 1 kg, even without accounting for inefficiency). It could be anchored to the high IMA pulley system (one of them triggering the other).

Wouldn't that still have an IMA of 1?

No, half the force comes from the free rope, the other half from the anchored rope. Example

I know very little about physics but all of the diagrams that look like that online say that the same set up has a IMA of 2
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2014 Dynamic: 5th, Rocks: 9th
2015 Dynamic: 3rd, Fossils: 2nd
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Robot Arm: na/1/1
Rocks: 1/1/1

2018 (r/s/n):
Heli: 2/1/7 :?
Herp: 1/4/4
Mission: 1/1/6 :cry:
Rocks: 1/1/1
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Re: Low IMA Pulley Task

Postby Unome » Tue Sep 05, 2017 7:26 pm

ScottMaurer19 wrote:
Unome wrote:
ScottMaurer19 wrote:Wouldn't that still have an IMA of 1?

No, half the force comes from the free rope, the other half from the anchored rope. Example

I know very little about physics but all of the diagrams that look like that online say that the same set up has a IMA of 2

butterfly...

What you would actually want is something like this:
pulley ima one half.png
pulley ima one half.png (7.48 KiB) Viewed 3821 times
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Re: Low IMA Pulley Task

Postby Tesel » Thu Sep 07, 2017 2:03 pm

The easier thing would be a simple block and tackle type pulley (I think that's what it's called). One fixed pulley and one movable pulley give you an IMA of 0.5 so long as you pull down on the movable pulley.
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Re: Low IMA Pulley Task

Postby Unome » Thu Sep 07, 2017 4:12 pm

Tesel wrote:The easier thing would be a simple block and tackle type pulley (I think that's what it's called). One fixed pulley and one movable pulley give you an IMA of 0.5 so long as you pull down on the movable pulley.

Agreed, this would be much easier. An illustration, for those not familiar with pulleys:

low IMA pulley.png
low IMA pulley.png (6 KiB) Viewed 3761 times
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Re: Low IMA Pulley Task

Postby Tesel » Thu Sep 07, 2017 7:19 pm

Unome wrote:
Tesel wrote:The easier thing would be a simple block and tackle type pulley (I think that's what it's called). One fixed pulley and one movable pulley give you an IMA of 0.5 so long as you pull down on the movable pulley.

Agreed, this would be much easier. An illustration, for those not familiar with pulleys:


Yeah that should be much more simple to construct, that looks right.
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Re: Low IMA Pulley Task

Postby absolutezerok3 » Sun Dec 10, 2017 6:06 pm

How would you go about activating the pulley?
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Re: Low IMA Pulley Task

Postby scioly2012 » Sun Dec 10, 2017 6:23 pm

absolutezerok3 wrote:How would you go about activating the pulley?


I dropped a weight into a bucket attached to the moveable pulley, which made it go down.

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Re: Low IMA Pulley Task

Postby PM2017 » Wed Dec 20, 2017 7:15 pm

Where are people getting their weights? They seem ridiculously expensive.
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Re: Low IMA Pulley Task

Postby VictoryChicken » Fri Dec 29, 2017 2:49 am

Unome wrote:
Tesel wrote:The easier thing would be a simple block and tackle type pulley (I think that's what it's called). One fixed pulley and one movable pulley give you an IMA of 0.5 so long as you pull down on the movable pulley.

Agreed, this would be much easier. An illustration, for those not familiar with pulleys:

low IMA pulley.png


Wow thanks for the illustration! Could you explain how you apply the effort in the example of the pulley system with the IMA of 0.50? Would the effort be pulled up?

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Re: Low IMA Pulley Task

Postby Unome » Fri Dec 29, 2017 2:23 pm

VictoryChicken wrote:
Unome wrote:
Tesel wrote:The easier thing would be a simple block and tackle type pulley (I think that's what it's called). One fixed pulley and one movable pulley give you an IMA of 0.5 so long as you pull down on the movable pulley.

Agreed, this would be much easier. An illustration, for those not familiar with pulleys:

low IMA pulley.png


Wow thanks for the illustration! Could you explain how you apply the effort in the example of the pulley system with the IMA of 0.50? Would the effort be pulled up?

No, it's pulled downward as usual (because it's better to let gravity do the work for you).
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Re: Low IMA Pulley Task

Postby davecutting » Sat Dec 30, 2017 10:02 pm

PM2017 wrote:Where are people getting their weights? They seem ridiculously expensive.


Try your HS physics department.
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Re: Low IMA Pulley Task

Postby PM2017 » Sat Dec 30, 2017 10:09 pm

davecutting wrote:
PM2017 wrote:Where are people getting their weights? They seem ridiculously expensive.


Try your HS physics department.


Thanks for the advice, but unfortunately, that solution isn't available to us.
One of the physics teachers at our school hates SciOly, so she won't help us. The other one doesn't have any to lend us, especially not for the whole year.
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