Author Topic: Help with levers  (Read 3250 times)

Offline mathsboy314

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Help with levers
« on: November 17, 2016, 06:08:35 am »
I need some help making an element. I explain the problem in this video:


Offline Linkin_J_Knex

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Re: Help with levers
« Reply #1 on: November 17, 2016, 05:20:21 pm »
Could you make the arm heavier? Then the small impact from the ball will be able to bring the arm down, using the weight of the arm not the weight of the ball. Nice element you've got there  :)
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Offline Sorunome

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Re: Help with levers
« Reply #2 on: November 17, 2016, 10:04:58 pm »
You could also try to drop the ball from a greater hight into the arm, thus the ball has a higher impulse when it reaches the arm

EDIT: Or, like, make it a two-ball element

It's looking awesome btw ^.^
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Offline mathsboy314

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Re: Help with levers
« Reply #3 on: November 17, 2016, 10:55:05 pm »
Could you make the arm heavier?
The element has 2 arms. When one goes up, the other goes down.

You could also try to drop the ball from a greater height into the arm
I'll try that.

Offline GWorks

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Re: Help with levers
« Reply #4 on: November 18, 2016, 02:29:11 am »
If you want to keep using 1 ball, another trick would be to use a longer arm. Because:
M = F * a
Explenation:
Moment (physics) [Newtonmeter] = Force [Newton] * arm [meters]
So, the longer the arm, the less force is needed to have the same momentum (force to rotate), thus making it easier to pull the cart.

Seeing as your arms are already pretty long, perhaps this is not the best solution. I like @Linkin_J_Knex 's option, to make the arms heavier.
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Offline Linkin_J_Knex

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Re: Help with levers
« Reply #5 on: November 18, 2016, 05:15:39 pm »
A longer and heavier arm, with a greater drop height :)All should work together to get it working
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Offline mathsboy314

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Re: Help with levers
« Reply #6 on: November 19, 2016, 11:25:55 am »
I fixed it. The problem was that the scaffold holding up the element was very unstable. Every time the ball went on the arm, the pieces holding the arm would bend a lot.

Offline Linkin_J_Knex

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Re: Help with levers
« Reply #7 on: November 19, 2016, 04:45:56 pm »
Ah okay, glad it's sorted :)
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Offline TheKnexGuy

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Re: Help with levers
« Reply #8 on: January 12, 2017, 02:51:50 pm »
Glad you figured it out. I love the element. If it would have instructions, I would definitely make it .
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Offline Jayaar

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Re: Help with levers
« Reply #9 on: January 14, 2017, 06:58:06 am »
This is a very cool element. I would also be interested in instructions for it if you ever develop them! :)