How high could you jump on a trampoline with increasing tension?

  • Thread starter h.g.Whiz
  • Start date
  • Tags
    Trampoline
In summary: If a trampoline's tension is increased in between jumps, the jump height may increase to some extent until it reaches a point where it is similar to jumping on a flat surface. However, the tension increase may potentially cause the trampoline to break. Alternately, increasing the tension may not necessarily increase jump height, but rather increase the g-forces involved in the bounce. Other methods, such as digging a hole under the trampoline or using a contraption to tighten and loosen the springs, could potentially increase jump height, but may also pose safety risks. Ultimately, there is a maximum jump height that can be reached with only gravity, the trampoline, and the human body, taking into account factors such as wind resistance and terminal
  • #1
h.g.Whiz
16
0
suppose you had a trampoline that you could increase the tension in between jumps so that every time you landed. (and there is plenty of room between the surface and the ground) what would happen .what if someone double jumps then two people etc.. would your jump height keep increasing
 
Physics news on Phys.org
  • #2
it would increase to some extent, till the tension would be similar to jumping on a flat surface. it would most likely break at that point, assuming you made a big enough tension increase in one jump, otherwise, it would gradually decrease... that's not clear, is it?
 
  • #3
h.g.Whiz said:
suppose you had a trampoline that you could increase the tension in between jumps so that every time you landed. (and there is plenty of room between the surface and the ground) what would happen .what if someone double jumps then two people etc.. would your jump height keep increasing

You would eventually break a leg or something. Your body couldn't handle the extra stiffness of the springs. It would be like jumping off of a tall building and bouncing as you hit the ground.
 
  • #4
Increasing the tension won't increase height, it just increase the g forces involved during the bounce. I'm not sure what you mean about two people, but one or more persons can provide the energy to bounce another person on a trampoline.
 
  • #5
Jeff Reid said:
Increasing the tension won't increase height, it just increase the g forces involved during the bounce.

Exactly, you would decellerate, and accellerate quicker for each bounce, however, we all know what happens when you decellerate too quick.
 
  • #6
The only way your jump height would increase is if you pumped energy into the system somehow. Increasing the tension doesn't change a thing about that.
 
  • #7
If the trampoline resonated with you, meaning, just as you went up, it stiffened to give you more acceleration up, I believe then you would have a partial harmonic-oscillator. partial because it's not a continuous spatial displacement.

If then you loosened it as you fell to allow for more displacement, and tightened it again in the periodic fashion, you definitely could increase your height.
 
  • #8
However, tightening it only does one thing: it increases the rate at which you decelerate and accelerate on the trampoline with the same displacement of the trampoline on landing.

A better way to achieve the same result without hurting yourself (provided that the springs are perfect, and you receive the same force upward that you do downward), is to dig a hole under the trampoline. Instead of increased acceleration through the tightened springs, the higher you bounce, the more displacement will occur in the springs, and you will get higher without hurting yourself. However, in reality, this will not work.
 
  • #9
That would be correct assuming a rigid body. With biological systems, it's more complicated. IRL, the tighter membrane might make you react to avoid injuring yourself.

To get good height, start with more potential energy like jumping from above the trampoline onto it. Don't go crazy though. I've heard stories of kids who tried jumping from a tree onto a trampoline. Not good.

Math Jeans said:
However, tightening it only does one thing: it increases the rate at which you decelerate and accelerate on the trampoline with the same displacement of the trampoline on landing.
 
  • #10
nanoWatt said:
If the trampoline resonated with you, meaning, just as you went up, it stiffened to give you more acceleration up, I believe then you would have a partial harmonic-oscillator. partial because it's not a continuous spatial displacement.

If then you loosened it as you fell to allow for more displacement, and tightened it again in the periodic fashion, you definitely could increase your height.

And where does the energy to tighten & loosen it come from?
 
  • #11
dst said:
And where does the energy to tighten & loosen it come from?

Perhaps it could be possible to create a contraption that puts a plate at each end of the spring in which one plate is at a distance from the end that extends. When the spring then extends to a certain point, it would make contact with the plate and complete the circuit, in which the plates would then apply force to the ends of the springs causing more force upward from the trampoline before returning to their original position.

It would take a little work, but it doesn't seem like a hard thing to do.
 
  • #12
Math Jeans said:
Perhaps it could be possible to create a contraption that puts a plate at each end of the spring in which one plate is at a distance from the end that extends. When the spring then extends to a certain point, it would make contact with the plate and complete the circuit, in which the plates would then apply force to the ends of the springs causing more force upward from the trampoline before returning to their original position.

It would take a little work, but it doesn't seem like a hard thing to do.

I meant as a restricted version of the original problem, i.e. nothing but gravity supplies the original energy.

Rephrased: Is there a maximum jump height, if we have nothing but gravity, the trampoline, human and well, a surface for the trampoline to rest on?
 
  • #13
dst said:
Rephrased: Is there a maximum jump height, if we have nothing but gravity, the trampoline, human and well, a surface for the trampoline to rest on?

Well, there is a maximum hight considering we are taking into account wind resistance. Eventually as we all know, you will reach terminal velocity (if it is a perfect trampoline). When your speed does reach terminal velocity, the difference in hight will depend on at which point in the trampoline's acceleration do you reach terminal velocity, and over time, that will be a constant point, and thus a maximum hight.
 
  • #14
dst said:
Rephrased: Is there a maximum jump height, if we have nothing but gravity, the trampoline, human and well, a surface for the trampoline to rest on?
A few web sites mention olympic competitors reach heights of 25 to 30 feet (top of head to the ground), which translates into an actual bounce height of 15 to 20 feet, with a trampoline that is 3.75 feet (45 inches) above the gym floor.

A competition trampoline "bed" is web made up of paired 1/8 inch diameter nylon chord, spaced about 5/8 inches apart, (called an "ozzie" bed, since an Australian manufacturer apparently made the first ones of this type), and is 7 feet wide by 14 feet long. There is very little air resistance on this type of trampoline bed, so the bounces are very elastic, not requiring a lot of energy. Former USA competition trampolines used 1/4 inch wide canvas strips instead of the nylon chords, and also had very little air resistance.

Home type trampolines typically have significant air resistance, and are not as energy efficient. Really old ones used canvas strips about 3/4 inch wide with about 1/4 inch wide holes. Outdoor trampolines use some type of black mesh which also has significant air resistance.

Youtube video from 2004 olympics:

 
Last edited by a moderator:
  • #15
Man that's crazy. I've been up on a utility pole at 30' above the ground, and that's scary. Though, I've also been at 60-feet as well which has a very nice view.

Jeff Reid said:
A few web sites mention olympic competitors reach heights of 25 to 30 feet (top of head to the ground), which translates into an actual bounce height of 15 to 20 feet, with a trampoline that is 3.75 feet (45 inches) above the gym floor.
 
  • #16
Right that's just monstrous. I guess the added energy comes from the trampoliner pushing their own weight, so to speak, adding to momentum and that gets stored + released by the trampoline. So it should be, in theory, possible to jump higher and higher and higher if you upped the tension each time (obviously G-forces would limit things somewhat).

30ft is just scary.
 

What is trampoline double jumping?

Trampoline double jumping is a type of activity where two individuals jump on a trampoline at the same time, performing synchronized or coordinated movements.

What are the benefits of trampoline double jumping?

Trampoline double jumping can improve coordination, balance, and cardiovascular health. It also provides a fun and exciting way to exercise.

Is trampoline double jumping safe?

Trampoline double jumping can be safe when proper safety measures are followed, such as having a spotter, using a trampoline with safety features, and avoiding risky stunts.

What are some tips for beginners in trampoline double jumping?

Some tips for beginners include starting with simple movements, always having a spotter, and gradually increasing the difficulty of the jumps. It is also important to warm up and stretch before jumping.

Can anyone do trampoline double jumping?

Trampoline double jumping can be enjoyed by people of all ages and fitness levels. However, it is important to consult a doctor before starting any new physical activity, especially for those with preexisting health conditions.

Similar threads

  • Mechanical Engineering
Replies
13
Views
950
  • Introductory Physics Homework Help
Replies
5
Views
10K
Replies
6
Views
5K
Replies
16
Views
3K
Replies
16
Views
41K
  • Nuclear Engineering
Replies
6
Views
4K
  • Other Physics Topics
Replies
6
Views
4K
  • Sci-Fi Writing and World Building
Replies
20
Views
1K
  • Introductory Physics Homework Help
Replies
5
Views
4K
Back
Top