Circular to Linear Task

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Primate
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Re: Circular to Linear Task

Postby Primate » December 29th, 2010, 8:42 pm

questionguy wrote:
penclspinner wrote:
Smok4hontas wrote:Would a ball rolling in a funnel then dropping straight done count in this task?


Nopes.


Why not? Isn't the ball rolling in a circle (Circular motion) and then dropping into linear motion when the circular motion keeps it moving until it reaches the hole?

But are you converting that circular motion into the linear motion? I would say no.
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Re: Circular to Linear Task

Postby ichaelm » December 30th, 2010, 7:10 am

In my opinion, I define circular motion in this case as motion that's the result of angular momentum, as opposed to linear momentum. A rolling ball, no matter what its path is like, has both angular momentum and linear momentum. The angular momentum arises from the fact that it is rolling, and the linear momentum arises from the fact that it is moving, translationally. But just letting that ball fall into a different path does not convert the angular momentum to linear momentum. In your example, the marble's gravitational potential energy is being translated into kinetic energy.

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Re: Circular to Linear Task

Postby elmono » December 30th, 2010, 11:39 am

What if the ball roles into a funnel and then drops onto a straight track. The (circular motion) of the funnel, the dropping of the ball is the conversion from circular, and the track causes it to change to linear?

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Re: Circular to Linear Task

Postby Primate » December 30th, 2010, 2:06 pm

elmono wrote:What if the ball roles into a funnel and then drops onto a straight track. The (circular motion) of the funnel, the dropping of the ball is the conversion from circular, and the track causes it to change to linear?

Elmono, we just discussed that. Please read the previous posts next time.
Last edited by Primate on December 31st, 2010, 5:48 am, edited 1 time in total.
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Re: Circular to Linear Task

Postby elmono » December 30th, 2010, 4:08 pm

Would a fan work as circular motion that blows a marble forward?? Technically the motion of the fan is circular and you are changing another objects motion to linear??

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Re: Circular to Linear Task

Postby Primate » December 31st, 2010, 5:48 am

elmono wrote:Would a fan work as circular motion that blows a marble forward?? Technically the motion of the fan is circular and you are changing another objects motion to linear??

Yep! See, the difference is, you're harnessing the energy and the undoubtedly circular motion of the fan to move the car forward, linearly.
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Re: Circular to Linear Task

Postby questionguy » December 31st, 2010, 3:55 pm

Primate wrote:
elmono wrote:Would a fan work as circular motion that blows a marble forward?? Technically the motion of the fan is circular and you are changing another objects motion to linear??

Yep! See, the difference is, you're harnessing the energy and the undoubtedly circular motion of the fan to move the car forward, linearly.


Would you be allowed to put that as two tasks, the moving air task and the circular to linear task?

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Re: Circular to Linear Task

Postby Primate » December 31st, 2010, 9:39 pm

questionguy wrote:
Primate wrote:
elmono wrote:Would a fan work as circular motion that blows a marble forward?? Technically the motion of the fan is circular and you are changing another objects motion to linear??

Yep! See, the difference is, you're harnessing the energy and the undoubtedly circular motion of the fan to move the car forward, linearly.


Would you be allowed to put that as two tasks, the moving air task and the circular to linear task?

You could argue that you're converting the circular motion of the fan to linear motion of the air, and then that movement of air is moving the car to cause the next action. But I wouldn't risk it.
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Re: Circular to Linear Task

Postby Hatch » January 6th, 2011, 6:54 pm

We wanted to know if a spinning horizontal device pushing a marble through itself, and then the marble rolling on to a slide like object would be ok for this task? :)
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Re: Circular to Linear Task

Postby Flavorflav » January 7th, 2011, 6:53 am

Primate wrote:
elmono wrote:Would a fan work as circular motion that blows a marble forward?? Technically the motion of the fan is circular and you are changing another objects motion to linear??

Yep! See, the difference is, you're harnessing the energy and the undoubtedly circular motion of the fan to move the car forward, linearly.

He didn't say car, he said marble. I would think a car is much safer than a marble, because parts of it are moving linearly. I would not be at all confident that any rolling object would qualify as linear.

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Re: Circular to Linear Task

Postby Primate » January 8th, 2011, 6:47 pm

Flavorflav wrote:
Primate wrote:
elmono wrote:Would a fan work as circular motion that blows a marble forward?? Technically the motion of the fan is circular and you are changing another objects motion to linear??

Yep! See, the difference is, you're harnessing the energy and the undoubtedly circular motion of the fan to move the car forward, linearly.

He didn't say car, he said marble. I would think a car is much safer than a marble, because parts of it are moving linearly. I would not be at all confident that any rolling object would qualify as linear.

Oh good call, I completely missed that. Well, so long as the object's position is changing (in one direction only, of course), I feel like it should qualify. But you're right, a car is safer.
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Re: Circular to Linear Task

Postby SPChroshaw » January 14th, 2011, 6:52 am

Would having a non-geared motor winding a string that pulled a mass count? The rotation of the motor is the circular motion and the forward movement of the mass is linear motion.

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Re: Circular to Linear Task

Postby Primate » January 14th, 2011, 9:14 pm

SPChroshaw wrote:Would having a non-geared motor winding a string that pulled a mass count? The rotation of the motor is the circular motion and the forward movement of the mass is linear motion.

That's a winch, so yep.
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Re: Circular to Linear Task

Postby sciencegirl23 » January 17th, 2011, 4:47 pm

Primate wrote:
elmono wrote:Would a fan work as circular motion that blows a marble forward?? Technically the motion of the fan is circular and you are changing another objects motion to linear??

Yep! See, the difference is, you're harnessing the energy and the undoubtedly circular motion of the fan to move the car forward, linearly.

I used this as my circular to linear step and they wouldn't accept it :(
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Re: Circular to Linear Task

Postby KNielsen » February 13th, 2011, 11:20 am

Another device that could be used is a rubber band or string suspending a weight. The band could be twisted enough so that it contracts upward while hanging onto the weight. When released, the string or band would uncoil (circular motion) and would drop down (linear). This would eliminate the need for gear ratios and hoping a judge interprets the rules as you did.


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