Patrick Skov Tricep Press

[tech_wreck47]

Wow...have any of you been in a weight-room? There are slots you put feet or thighs under when moving a load heavier than you. Now, I agree that 390 on this machine is not really 390, but it's not 50% of 390. His feet are braced.

I go to the gym pretty often and most tricep push down machines don't have that, those are more of Bo flex type machines.

 

[Northeast Stinger]

I think what happens is this. As he pulls down on the 390 pounds the force of gravity moves the earth closer to the weight. So with each pull, even though he would be lifted off the ground ordinarily, the ground is moving to meet the the 390 pounds thus maintaining contact with the bottom of his feet the whole time.

 

[GTJason]

Not really seeing your point. See below:

"The mechanical advantage of a pulley system is determined by the number of ropes hanging on the sides of all pulleys that are working against gravity. A single fixed pulley uses only one rope, where the load is lifted by the same distance as the other end of the rope is pulled down. In a 1:1 mechanical advantage, the applied force is the same regardless of the pulley being used."

http://www.ask.com/science/mechanical-advantage-single-fixed-pulley-7a9e86e6f908f748

The advantage of a single fixed pulley is it changes the direction of the input force, it doesn't multiply it.

It's not the pulley system at all. As I said it's where his weight is in relation to where the force is being applied. His forearms are the short lever arm and his humerous/chest is the long lever arm where his elbows are the fulcrum. It's a simple machine, just not a pulley

 

[dressedcheeseside]

It's not the pulley system at all. As I said it's where his weight is in relation to where the force is being applied. His forearms are the short lever arm and his humerous/chest is the long lever arm where his elbows are the fulcrum. It's a simple machine, just not a pulley

I get that, but he still has to generate 390 lbs of effort force, right?

 

[Declinometer]

Please stop! He can't push down 390 lbs! The machine doesn't even go up to 390. Each plate is 10 lbs so the max is 200 lbs.

 

[dressedcheeseside]

I go to the gym pretty often and most tricep push down machines don't have that, those are more of Bo flex type machines.

View attachment 1011

Ahhhh, but this machine has a movable pulley attached to the stack creating a 1:2 mechanical advantage. If Skov's machine is like this, he is only moving 195 lbs which is less than his body weight.

 

[tech_wreck47]

Ahhhh, but this machine has a movable pulley attached to the stack creating a 1:2 mechanical advantage. If Skov's machine is like this, he is only moving 195 lbs which is less than his body weight.

So it's only 50%? I thought it was more like 70% they were actually lifting on machines like that?

 

[Frenchise]

I go to the gym pretty often and most tricep push down machines don't have that, those are more of Bo flex type machines.

View attachment 1011

If it's truly got 400lbs of plates, it will have foot braces.

I don't think it's got 400 lbs of plates though.

 

[furant]

Now we've gone and messed up a formerly enjoyable thread with dynamics.

 

[ChasonBaller]

Hahahahaha, who wants to bet that this convo has never been on a uga fan forum?

 

[Yoda]

Terrible discussion.

 

[Dottie1145]

This is 420, skov might be getting 225

 

[tech_wreck47]

This is 420, skov might be getting 225

I don't even consider him doing 420, his form is awful and not even doing the right range of motion.

 

[Dottie1145]

I don't even consider him doing 420, his form is awful and not even doing the right range of motion.

Yeah. I agree, but look at the weight that he added to the machine. I was just pointing out that Skov wasn't pulling down 390, at the most it's 260

 

[CuseJacket]

Spin off from the GTCamp15 thread. Carry on.

 

[Chris Freeman]

God, we are some nerds... lol

 

[kg01]

God, we are some nerds... lol

What's this "we" stuff? Some of us realize this is a useless conversation.

 

[ilovetheoption]

Changing the vector actually does matter in this instance, as it allows the horizontal friction between his feet and the floor to act as an anchor against which to pull, no?

 

[ilovetheoption]

Also, look at the distance the weights travel against the distance his hands travel. The hands travel way further, thus we can conclude that the pully system is indeed providing an advantage, and that it's not 390 lbs to him.

 

[GTL]

How come, when I try 390 it won't move? That's what I can't figure out.

That's my problem, too!