On May 08 2012 19:51 capaneo wrote:
What is amusing to me is that the weight of the person is not a factor about how far he can jump. There are two exceptions I can think of :
1: The springs are stretched beyond their yield point. Which they clearly are not here as the device bounces back normally.
2: There can be some stop implemented on the jump device that doesn't let springss length go beyond a critical limit. (possible)
So it looks to me that its all about the technics of the jumper and not the weight.
All that being said I don't understand why this seems funny to people when a fat guy fails at it while this has NOTHING to do with weight?
Wow you are truly bad at physics and logic, or are a really subtle troll, I'll hope for the latter although I'm certain it's the former.
If you have a machine, in this case some muscles stretching tendons, that can only produce a specific, limited amount of power
to move this machine vertically from the ground - what happens when you add weight to the machine?
A) It moves further away from the ground in a single movement
B) It moves a shorter distance or completely stops moving from the ground in a single movement
C) None of the above
Your poorly written question is not relevant to this case.
Answer this for me first please, you have a trampoline on ground. You drop a 70kg weight from 10m on the trampoline and the weight will rise to A meters after the first bounce. Then you drop a 140kg weight on the trampoline from 10m. The 140Kg weight will rise B meters after first bounce. in both cases the max load stays within the elastic range of the trampoline.
a) A = B
b) A > B
c) A < B
d) You need to have the spring constant K for the trampoline to make a decision.
Answer this for and if you are still interested check the spoiler to get the human jumping equivalent system.
Part B. Now assume that in both cases the weights have a spring mechanism attach to the bottom of the weight. This "spring mechanism" provides 2 meters of vertical "jump" for their attached weight when stationary on the ground. Knowing that this mechanism is timed to engage at the optimal point when the weights hits the trampoline. What can one concludes about the max new hights A` and B`?
Q B1:
a) A` = A , B` = B
b) A` > A , B` > B
c) A` < A , B` < B
d) You need to know more details about the "spring mechanism" constant
Q B2:
a) A` = B`
b) A` > B`
c) A` < B`
d) You need to have the spring constant K for the trampoline to make a decision.
What is amusing to me is that the weight of the person is not a factor about how far he can jump. There are two exceptions I can think of :
1: The springs are stretched beyond their yield point. Which they clearly are not here as the device bounces back normally.
2: There can be some stop implemented on the jump device that doesn't let springss length go beyond a critical limit. (possible)
So it looks to me that its all about the technics of the jumper and not the weight.
All that being said I don't understand why this seems funny to people when a fat guy fails at it while this has NOTHING to do with weight?
wtf it's not about his weight, it's about a black man who can't jump
1
Sanity United States. May 09 2012 08:29. Posts 1076
What is amusing to me is that the weight of the person is not a factor about how far he can jump. There are two exceptions I can think of :
1: The springs are stretched beyond their yield point. Which they clearly are not here as the device bounces back normally.
2: There can be some stop implemented on the jump device that doesn't let springss length go beyond a critical limit. (possible)
So it looks to me that its all about the technics of the jumper and not the weight.
All that being said I don't understand why this seems funny to people when a fat guy fails at it while this has NOTHING to do with weight?
facepalm
1
Jas0n United States. May 09 2012 10:58. Posts 1866
On May 09 2012 00:37 capaneo wrote:
Your poorly written question is not relevant to this case.
Answer this for me first please, you have a trampoline on ground. You drop a 70kg weight from 10m on the trampoline and the weight will rise to A meters after the first bounce. Then you drop a 140kg weight on the trampoline from 10m. The 140Kg weight will rise B meters after first bounce. in both cases the max load stays within the elastic range of the trampoline.
Your superior writing style will not increase the validity of your pointless, irrelevant, facepalmworthy anecdote.
You drop a 70kg weight from 10 meters, OK, that's fine, we can assume that the 70kg machine can jump 10 meters;
but here's where you went ridiculously off path, and probably went astray in your original thought process:
The 70kg machine with the same amount of muscle can not jump the 10 meters with 70kg of fat added to it
if the 70kg machine could only jump 10 meters.
Your entire post is based on this faulty premise, the premise that the entire point of my post was to explain to you:
The drop is less for the machine that can't jump as high because it has the added weight but no added power.
Which goes higher up in the air: A 70kg weight dropped from 10 meters above the trampoline or a 140kg weight dropped from 5 meters above it?
As a bonus I linked this discussion to my Ph.D. in-something-I-can't-translate former-physics teacher and he replied:
"Ha ha! That is a classic example of a mistaken premise" [translated]
On May 08 2012 19:51 capaneo wrote:
What is amusing to me is that the weight of the person is not a factor about how far he can jump. There are two exceptions I can think of :
1: The springs are stretched beyond their yield point. Which they clearly are not here as the device bounces back normally.
2: There can be some stop implemented on the jump device that doesn't let springss length go beyond a critical limit. (possible)
So it looks to me that its all about the technics of the jumper and not the weight.
All that being said I don't understand why this seems funny to people when a fat guy fails at it while this has NOTHING to do with weight?
Wow you are truly bad at physics and logic, or are a really subtle troll, I'll hope for the latter although I'm certain it's the former.
If you have a machine, in this case some muscles stretching tendons, that can only produce a specific, limited amount of power
to move this machine vertically from the ground - what happens when you add weight to the machine?
A) It moves further away from the ground in a single movement
B) It moves a shorter distance or completely stops moving from the ground in a single movement
C) None of the above
Your poorly written question is not relevant to this case.
Answer this for me first please, you have a trampoline on ground. You drop a 70kg weight from 10m on the trampoline and the weight will rise to A meters after the first bounce. Then you drop a 140kg weight on the trampoline from 10m. The 140Kg weight will rise B meters after first bounce. in both cases the max load stays within the elastic range of the trampoline.
a) A = B
b) A > B
c) A < B
d) You need to have the spring constant K for the trampoline to make a decision.
Answer this for and if you are still interested check the spoiler to get the human jumping equivalent system.
Part B. Now assume that in both cases the weights have a spring mechanism attach to the bottom of the weight. This "spring mechanism" provides 2 meters of vertical "jump" for their attached weight when stationary on the ground. Knowing that this mechanism is timed to engage at the optimal point when the weights hits the trampoline. What can one concludes about the max new hights A` and B`?
Q B1:
a) A` = A , B` = B
b) A` > A , B` > B
c) A` < A , B` < B
d) You need to know more details about the "spring mechanism" constant
Q B2:
a) A` = B`
b) A` > B`
c) A` < B`
d) You need to have the spring constant K for the trampoline to make a decision.
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Sweden. May 09 2012 18:16. Posts 4472
