4 ms·

i don't understand what this means. you understand that g = 9.81 m/s^2 ... every second? the difference between colloquial lifting and just holding is a matter

i don't understand what this means. you understand that g = 9.81 m/s^2 ... every second? the difference between colloquial lifting and just holding is a matter of applying on the order of just 1% more force.

toasterlovin 9y ago
There is a difference between a material’s chemical bonds resisting the acceleration of gravity and actually being able to lift an object from one height to a second, higher height.
tomp 9y ago
I'm not talking about force, but about energy. To hold something suspended in air, you don't need any energy. But a steel wire can't lift anything, you need to have a motor (or muscle) that actually expends energy to move the object higher.
- deleted 9y ago
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- keenerd 9y ago
  A steel wire can lift things all by itself. Just cool the wire. If you disagree with this, consider the motor or hydraulic cylinder that can't lift anything either. (Without an external source of energy like a battery or compressor.) I'm half serious about this. The other main "artificial muscle" technology is nichrome wire after all.
deleted 9y ago
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SketchySeaBeast 9y ago
So if we took away 1% of that 1000x it's own weight it would be able to lift it? It can't. It will never be able to. Only thing I got out of my engineering dynamics class - ropes don't lift. Well, that and jokes about couple moments. A lift is not a hold. A human can hold a ton of weight against gravity, but that's not them lifting it. See the squat. You can put a huge amount of weight on your back compared to the amount you can actually move. If you put them on an escalator, they could probably even move a distance with it. But that isn't them lifting it that distance.
- arghwhat 9y ago
  A human can hold several loaded shipping containers stacked upon each other against gravity. The human will be very flat and leaking all over, but it will be holding the containers.
  - SketchySeaBeast 9y ago
    "I guess he kind of bench pressed that steam roller... kind of."
    - arghwhat 9y ago
      He lifted it several millimeters off the ground!
- mlevental 9y ago
  as someone who stalls out at the midpoint of a squat coming up very often i can tell you that locking your knees with weight on your back is not holding anything - it's putting your posterior chain under compression. my point was that something like a barbell hold (like this http://www.myfitnessstudio.co.uk/wp-content/uploads/barbell-bicep-curl.JPG http://www.myfitnessstudio.co.uk/wp-content/uploads/barbell-...) is just as hard as just curling.
- deleted 9y ago
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ricardobeat 9y ago
You mean infinity more force, since at rest (holding) no force is being applied at all.

toasterlovin 9y ago

There is a difference between a material’s chemical bonds resisting the acceleration of gravity and actually being able to lift an object from one height to a second, higher height.

tomp 9y ago

I'm not talking about force, but about energy. To hold something suspended in air, you don't need any energy. But a steel wire can't lift anything, you need to have a motor (or muscle) that actually expends energy to move the object higher.

deleted 9y ago
[deleted]
keenerd 9y ago
A steel wire can lift things all by itself. Just cool the wire. If you disagree with this, consider the motor or hydraulic cylinder that can't lift anything either. (Without an external source of energy like a battery or compressor.) I'm half serious about this. The other main "artificial muscle" technology is nichrome wire after all.

deleted 9y ago

[deleted]

SketchySeaBeast 9y ago

So if we took away 1% of that 1000x it's own weight it would be able to lift it? It can't. It will never be able to. Only thing I got out of my engineering dynamics class - ropes don't lift. Well, that and jokes about couple moments. A lift is not a hold. A human can hold a ton of weight against gravity, but that's not them lifting it. See the squat. You can put a huge amount of weight on your back compared to the amount you can actually move. If you put them on an escalator, they could probably even move a distance with it. But that isn't them lifting it that distance.

arghwhat 9y ago
A human can hold several loaded shipping containers stacked upon each other against gravity. The human will be very flat and leaking all over, but it will be holding the containers.
- SketchySeaBeast 9y ago
  "I guess he kind of bench pressed that steam roller... kind of."
  - arghwhat 9y ago
    He lifted it several millimeters off the ground!
mlevental 9y ago
as someone who stalls out at the midpoint of a squat coming up very often i can tell you that locking your knees with weight on your back is not holding anything - it's putting your posterior chain under compression. my point was that something like a barbell hold (like this http://www.myfitnessstudio.co.uk/wp-content/uploads/barbell-bicep-curl.JPG http://www.myfitnessstudio.co.uk/wp-content/uploads/barbell-...) is just as hard as just curling.
deleted 9y ago
[deleted]

ricardobeat 9y ago

You mean infinity more force, since at rest (holding) no force is being applied at all.