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physics question

Your poem reminded me about some thoughts I'd been having re: weight/mass and gravity, [personal profile] amaebi!

If you imagine something the size of a baseball, but that you are unable to pick up because it's so heavy, then that item is going to affect the ground it's on more/differently than a baseball would. If the ground is soft, the uncannily heavy ball is going to sink into it more, right? And if it were so heavy that an earthmover couldn't lift it up, it would--under normal physics--probably sink deep into the ground, right? Because an earth mover could scoop up **underneath** it otherwise--and the only way that wouldn't work would be if the thing were at the bottom--which it would be, if it were heavier/more massy than stuff around it... right?

So if you want to have an item that can't be lifted, but **doesn't** deform the land around it in this way, then normal physics aren't in operation.

... Is that correct?

This entry was originally posted at https://asakiyume.dreamwidth.org/876819.html. Comments are welcome at either location.


( 8 comments — Leave a comment )
Feb. 9th, 2018 03:31 pm (UTC)
If you tried to lift this heavy object that was sinking into the ground with an earth mover, that would mean that the earth mover would probably sink into the earth. It's wheels perhaps have less contact space with the same earth as the heavy object. One could see the earth mover sinking faster than the heavy object was, so much so, that it could find itself underneath the heavy object and speed the heavy object's descent into the earth. This must not be normal physics at work. Probably, um, well maybe. ?
Feb. 10th, 2018 01:21 pm (UTC)
(Love this new icon!)

And yeah... "probably, um, well maybe" is my general remark always when hazarding anything about real-world physics!
Feb. 9th, 2018 10:19 pm (UTC)
; )
i think the answer is 6
Feb. 10th, 2018 01:21 pm (UTC)
Re: ; )
(But only on Saturdays)
Feb. 10th, 2018 03:51 pm (UTC)
RE: Re: ; )
today is saturday!
Feb. 10th, 2018 04:10 pm (UTC)
Re: Re: ; )
Indeed! Today the answer is 6!
Feb. 14th, 2018 05:09 am (UTC)
Hi Asaki, you are correct- if the object is too massy it will deform or sink into the ground below it. Pardon the engr, online after so long- an increase in stress- weight- will result in an increase in strain- deformation- of the surface supporting it, a basic of materials science, which i'm very lucky to remember from so many moons ago. If the local stress- weight pushing down- exceeds the shear- splitting or tearing- strength of the supporting surface, it will then sink into the ground, I'll try to post an image...
Feb. 15th, 2018 12:32 pm (UTC)
Thank you! And thanks for your post, too.
( 8 comments — Leave a comment )

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