Screw Task

oofboy69
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Re: Screw Task

Postby oofboy69 » March 3rd, 2019, 9:57 am

What if the screw doesnt actually move at all, but rotates in place, using its threads to move a platform that it is screwed into more than 2cm?

nicholasmaurer
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Re: Screw Task

Postby nicholasmaurer » March 4th, 2019, 3:03 pm

What if the screw doesnt actually move at all, but rotates in place, using its threads to move a platform that it is screwed into more than 2cm?
The rule only requires the object to move 2 cm, not the screw itself.
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C8H10N4O2!
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Re: Screw Task

Postby C8H10N4O2! » March 5th, 2019, 4:33 pm

What if the screw doesnt actually move at all, but rotates in place, using its threads to move a platform that it is screwed into more than 2cm?
The rule only requires the object to move 2 cm, not the screw itself.
I know that this was discussed earlier, but a recent FAQ (maybe national clarification) has stated that the screw is NOT the object.

Shr3D
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Re: Screw Task

Postby Shr3D » March 10th, 2019, 10:30 am

Ok so my screw task was like this:

There was a ball being pulled by a string, which was rotated around the screw. The screw rotated when a mass was dropped and rotated the screw... which then roasted the string pulling on the ball... it kinda worked like a pulley yet did what was said in the rules. Although, I went to a competition and there I didn’t get points for it since the screw needs to work like its simple machines definition: it needs to be rotated and then needs to push an object as it rotates.

Hope this helps!
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knightmoves
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Re: Screw Task

Postby knightmoves » March 10th, 2019, 10:40 am

I have a screw holding an object in place on a ledge, the screw rotates (moves less than 2 cm), and the object falls, mostly by force of gravity. It depends on how you explain it, but MIT, my state ES, and Cornell all had no problems with it.
I'm surprised by this.

"clearly rotate a screw at least two full rotations so that it operates as a screw converting rotational force into linear force and moves an object at least 2 cm before that object initiates the next action."

I read that as saying that the object must be moved 2 cm by the linear force provided by the screw. In your example, the object is moved a short distance by the screw action, and then falls. So I don't think it is true to say that your screw "moves an object at least 2 cm".


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