Homework Help: How does mass of the bungee jumper effect a safe jump

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1. Mar 11, 2016

gagzi bear

1. The problem statement, all variables and given/known data
physics major practical, I was supposed to change the mass and find how it effects the safety of the jumper.But since hooks law doesn't follow bungee cord i really cant find a relationship.

2. Relevant equations

3. The attempt at a solution
I used a bungee cord and hung different masses on it and recorded the relevant extension of the bungee.and I got a curve sort of thing when i graph.
i dont understand how to show how mass effects the safety.
i figured out the conservation of energy equation for this prac
mgh=0.5kx^2 by doing some calculations of PE and KE

Last edited by a moderator: Mar 11, 2016
2. Mar 11, 2016

haruspex

First, you need to think what behaviour of the system would be unsafe at a given site.

3. Mar 11, 2016

gagzi bear

im thinking how to show that there is a point where the string would break. and show that using there is a mass it can hold.
ive done my practical changing mass and taking the stretched distance

4. Mar 11, 2016

haruspex

That would depend on the tensile strength of the cord.
There are at least two other safety considerations.

5. Mar 11, 2016

gagzi bear

yes but i was told to use mass as a factor affecting the safety of a bungee jump.
i dont know how to use my data to find tensile strength

6. Mar 11, 2016

haruspex

I mean, two other safety considerations in which mass will be relevant.

7. Mar 12, 2016

gagzi bear

wow i dont know that can you please tell me

8. Mar 12, 2016

jbriggs444

It is not our way to spoon feed the answers to school work. You are expected to put in the effort yourself.

What kind of harmful incidents might occur in a bungee jump?

9. Mar 12, 2016

gagzi bear

the only way i know is because of heavy mass of jumper the string breaks and he hits the ground.

10. Mar 12, 2016

haruspex

Imagine yourself in a bungee jump. As you approach the ground, what do you feel? What possibilities worry you?

11. Mar 12, 2016

gagzi bear

since ive never been on a bungee jump
i would worry if i would hit the ground.
are you talking about speed or gravity

12. Mar 12, 2016

haruspex

Yes, hitting the ground is certainly a concern. That would happen if the rope breaks, but there is another way it could happen.
Also consider why an ordinary, but very strong rope would not be suitable.

13. Mar 12, 2016

gagzi bear

because the stiffness would change the damping effect and would not stretch properly and would lose the fun

14. Mar 12, 2016

jbriggs444

A particular form of execution is based on stiff ropes...

15. Mar 12, 2016

gagzi bear

how is that related to bungee jumping

16. Mar 12, 2016

jbriggs444

Both involve a rope bringing a falling person to a halt.

17. Mar 12, 2016

gagzi bear

yah makes sense now.
So what do you want me to answer now.
im pretty much stucked in the same place since 12 hours without knowing the answer.
and doing researches
so can you please tell me so that i can take a rest

18. Mar 12, 2016

jbriggs444

No. That is not what we are here for.