/sci/ - Science & Math

It will not move.

>>4529074
Yes, it will.

>>4529082

Proof

good luck finding a stong enough magnet. will not move

>>4529091
it will move. magnet toward truck, truck a little toward magnet. assuming those circles on the arm are hinges. then it will stop

common sense should tell you it will not move

>>4529118
>doesn't know how magnets work

If this worked then you could lift yourself up by pulling your hair.

>>4529106
It's net momentum at ALL times during said "motion" is still zero.

This means it is not moving as its center of mass is stationary, and if there is any point on it that we would consider to represent its position it would be the center of mass..

Which doesn't move... So it doesn't move.

/thread

>>4529124
so something spinning isn't moving either? because its centre of mass doesn't move?

>>4529072
Why don't you just stick a piece of negative mass on a piece of positive mass?

We should do a small scale test or send that shit to the mythbusters

>>4529128
yup.

>>4529128

He means linear momentum. The crane will move but the whole doesnt acquire horizontal speed

>>4529124
>It's net momentum at ALL times during said "motion" is still zero.

like the solar system, in the solar systems centre of mass's frame

>>4529124
>it's net momentum is zero

When two particles of same mass and same velocity collide, they're net momentum is zero as well and there centre of mass is stationary to. Does that mean theirs no motion?

>>4529134
i know, but he's redefined "move" so i'm trolling him with pedantry and truth

>>4529131
nope. see almost any other post itt

Func fact: If you stood in a perfectly slippery ice ring, you wouldnt be able to get your center of mass move horizontally no matter how you move your body. But you could make youself spin for example.

>>4529140
>angular momentum is not conserved

i don't think so tim

>>4529140
You couldn't move or spin. Unless other parts of you moved or span the opposite amount.

>>4529140
>implying you couldn't just fart to put yourself in motion

>>4529154
fart is part of your mass

centre of mass still wouldn't move.

you could spin by farting though

>>4529154

Touché

>>4529162
*though zero total spin of course

>>4529162
>>4529162

But a fart means mass leaving your body and thus with momentum. In orfer to conserver the total (0) you need to move in the opposite direction

Seriously guys? I remember having to prove this shit didn't work as an exercise in high school freshman physics. It's really not that hard.

>>4529173
>>4529173

Wait I am wrong, the center of mass cant move.

>>4529431

that won't work, this will

no seal problem

>>4529493

excellent improvement, anon. and since it doesn't depend on the number of balls, the chain could be replaced with a closed and flexible air-filled tube. that makes it easier to drive the generator.

>4529431 You pretty much made an odd looking windmill...

people still post this? its been years now

I wish these threads didn't pop up quite so often with the same basic idea.
Trolls need to be more varied and creative.

>>4529493
>>4529431

this one's better

>>4529746

I AM BUILDING IT

>>4529756
>>4529072

Shards would just gather at the top, surely?

>>4529768
>>4529746

Water wouldnt stay with the metal shards, it doesnt have reason to..
..use ferrofluid instead!

>>4529942

would this work, if the stick is big enough

>>4530311
no

>>4530317

why not

Magnetic fields do no work. Take a basic electromagnetism class.

Dat truck aint movin

>>4529942

The amount of energy needed to push something 1 lightyear long is staggering...and likely what is needed to actually reach lightspeed.

The experiment doesn't understand it's own limits.

>>4529140
But if it was "perfectly slippery" (read as: ZERO friction) then all you'd have to do is get down on your belly and blow your breath out in a thin stream as hard as you can, creating thrust, and you'd slide across the surface, right?

>>4530449
The force would travel through the stick like waves through water, you may not have thought of solids working like this before but it's true; it would not poke faster than the speed of light.

>>4530449

the gravity well would to too strong