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/sci/ - Science & Math

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8299074 No.8299074 [Reply] [Original]

why does this not work?

>> No.8299087

>>8299074
Newtons third

>> No.8299100

>>8299087
what would it do? stay still? rotate?

>> No.8299159

>>8299100
It would rock in place a bit.

>> No.8300399

It would work, you just need energy to accelerate the beams

>> No.8300569

When you stop the beam there should be an equal force going backwards?

>> No.8300579

>>8300569
Yep

Has anyone named the law that says you can't generate a net force without having more than one frame of reference in the system?

>> No.8300582

>>8299074
It ignores the force from the green halves as they make the half turn.

>> No.8300586

>>8299074
Uhh... collapsible spinning dumbbells?

>> No.8300591

>>8300399
>Go back to high school

>> No.8300592

>>8299100
On a frictionless platform it would suddenly start moving forward when the first halves stop, then decelerate, reach a stop when the halves still spinning are at 9 o'clock, then start moving backwards, and come to a sudden stop at its original position when the second halves stop.

On a platform with friction it would probably shift forward a bit due to the two sudden forces being able to overcome friction but not the gradual ones.

>> No.8300596

>>8300592
Noticed it says "spaceship," so the first one.

>> No.8300607

>>8300596
Also it will rotate counterclockwise, with maximum rotation rate when the second halves are at 9 o'clock.

Final state will be unmoving and unrotating at the starting position but rotated counterclockwise.

>> No.8301062 [DELETED] 

>>8300592
>>8300607
thanks

>> No.8301067

>>8300592
>>8300607
thanks