Rhett Allain
Region: US
Wednesday 12 August 2026 13:34:24 GMT
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Dennis :
Weight is the gravitational force on an object. That definition includes no other forces. The question should have been "which object measures more force on a scale?"
2026-08-23 17:25:31
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Billie Cook :
I’m an engineer so they’re the same. And g is 10
2026-08-12 20:48:47
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Michael Barrowman :
But you said that they HAVE the same mass. Not that we measured their weight and reverse engineered their mass.
2026-08-12 15:27:21
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Ivan :
False reasoning
2026-08-22 05:33:02
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Pat Fenis :
So one kilogramme of steel is heavier than one kilogramme of feathers?
2026-08-12 15:15:34
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Cabbage_the_Cat :
You changed the stipulation. You said assuming the masses are equal, do they have the same weight? If the masses are actually equal, the plastic block would weigh less, because it has a greater buoyant force.
2026-08-12 14:52:59
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Adam Amazon Unc :
This is actually pretty cumbersome: if you measured the mass to be identical, then the weight is also identical…because your device measuring the mass either converts weight to mass or eliminates buoyancy force by balancing it on both sides of the balance. So this problem is incorrect if you “measure the mass and find them equal”
2026-08-13 11:34:08
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Cole :
Let’s drop the assumption of a constant gravitational field… the sum over all gravitational forces for each atom will then give us the total. With most of the plastic atoms having a greater distance to earths center (F is inverse prop. to r^2) on average it will experience less gravitational pull than the copper (very minimal I know ;))
2026-08-13 09:38:36
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Thibaut :
ah ah yes! however you forget another factor: the center of gravity of the small object is closer to the ground so it is slightly more attracted.
2026-08-12 15:00:59
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cragg2405🇨🇦 :
What happens if you weigh them in a scale in a vacuum?
2026-08-13 04:16:04
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Robert McGregor :
44g is the weight
2026-08-12 15:49:13
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Canardia :
The copper block has more air above it, so it adds to its weight more than on the plastic block.
2026-08-12 15:37:18
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graf_kotiakula :
There is no buoyancy force if objects are laying on the scales though (there is no air under boxes)
2026-08-12 18:48:20
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MrFord :
To try to understand this - if you could increse the size of the larger block but it maintained its weight, is there a theoretical size in which its buoyancy would equal the gravitational force in the opposite direction so it would weigh nothing - surely not, because of that I cant wrap my head around this
2026-08-13 19:55:41
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Aron 09 :
i deadass thought that the center of gravity of the plastic blocks being farder for the earth core than the copper made the plastic block less affected from the gravity (because gravity becomes weaker by the square of the distance) and so it weighted less
2026-08-12 23:51:50
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poppariosasto :
You are just doing a bad measurement. Of course it needs to be measured in a vacuum
2026-08-14 02:44:37
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willmclearen :
The question indicated MASS, not calculated mass. You’re applying the buoyancy force at the wrong time. What you measured on the scale was weight. Try again! You’re confusing the people who learned the correct terminology and applied it the way you originally stated. I generally like your thought experiments, but here you’re just changing the question.
2026-08-13 00:45:38
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RoilNavE :
So you’re telling me that if you used heat and/or pressure to squeeze the plastic into the same size, it would no longer weigh the same 44g?
2026-08-12 16:16:52
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sakwensivie :
I think the main factor your getting at here is that because it is measured in a fluid(air) then bouancy could be a factor that would be considered. If the fluid was say water that would be more significant hence you’d measure different weights.
2026-08-14 13:15:00
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jay cliff825 :
that's all nonsense. mass is just gravity pulling down so buoyancy is not a factor. even if you stretch the copper out to have the same surface area weight and mass are the same then both float on water. but none of that matters.
2026-08-13 18:50:11
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ilki883 :
Did you think about the following?: The plastic body has more height, so the top of it has a greater distance to the earth, so gravitation pulls a liiiiiittle bit less on the top than on the bottom, could this cancel out the liiiiiittle more FB?
2026-08-12 15:16:16
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Ainārs Zvaigzne :
used same logic . but 100% oposit result
2026-08-12 15:17:35
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Ben :
I made the terrible assumption that the measurement would be done in a vacuum.
2026-08-13 03:56:11
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🦏 Big Daddy Rhino 🦏 :
What about the centrifugal force of the rotation of the Earth?
2026-08-12 17:16:35
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DangSaraf :
wouldn't more bouyance make the object lighter?
2026-08-13 18:57:23
1
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