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/sci/ - Science & Math

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11371250 No.11371250 [Reply] [Original]

Why is it so hard to hold on a deadlift ?
Once you get the weight off the ground ,supposedly you don't have to provide any more work , all you have to do is provide a reaction force as if the weight was on the ground.

Then why do you get tired the longer you hold on ?

>> No.11371263

>>11371082
your earlier thread is still up, try not to shit up the board

>> No.11371281

>>11371263
But this one has a women hence a higher chance of someone answering my question.

Also if running at a constant speed requires no work , why do i get tired ?

>> No.11371300

This is the dumbest fucking shit I've ever read. OP you are legitimately retarded.

>> No.11371305

>>11371250
>>t. high school physics 11 student who just learned what "work" is.

>> No.11371310

>>11371250
>why is it so hard to keep hundreds of pounds of iron from dropping to the floor with your bare hands
Delete this worthless board already.

>> No.11371329

It's because most of these deadlifters don't understand basic physics. The harder you lift, the greater the force of gravity (Newton's action and reaction law)

>> No.11371493

>>11371329
What ?

>> No.11371500
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11371500

>> No.11371502

>>11371250
Grip.

>> No.11371804

>>11371500
Why are you laughing ?

>> No.11371821

Because your muscles have to expend energy just to maintain a constant force, even if no mechanical work is being done. A biologist would have a better answer. Something something anaerobic respiration, I think.

>> No.11371979

>>11371804
1 thread, 8 retards I'm guessing.

>> No.11371989

Why can't I build muscle?

>> No.11372025

When we finish building a suspension bridge, why don't we remove the towers and the cables to reuse them, since the road deck is already in place? Seems like a waste of materials.

>> No.11372027

>>11371821
The muscles expand and contract when maintaining force so there is work being done from the muscles even if no external distance is covered.

>> No.11372030

>>11372025
The OP isnt a stupid question.

>> No.11372053

>>11371281
Because you're not running in a vacuum and your center of mass oscillates vertically.
>>11372025
Bad analogy. Towers and cables don't consume energy and don't get tired.
Inb4 "but muh material fatigue": not the same thing.

>> No.11372084

>>11371250
In space, after 'lifting', the only work you'd do would be the work to stop the bar from moving up into your face.

>> No.11372170

>>11371250
SHITPOST.

>> No.11372187

>>11371250
There's only one answer to this. Or two answers which are compounded. Muscles are limited by ATP and grip strength is limited by friction.

>> No.11372207

The most frustrating thing is the people who reply to these threads seriously.

>> No.11372275

>>11371250
once you lock out your joints (knees and hips), you can hold a deadlift for as long as your grip allows. if you use straps, it can be a full minute or so.