The three forces acting on the bungee jumper are gravity pulling the jumper downward, tension in the bungee cord pulling the jumper upward, and air resistance opposing the jumper's motion through the air.
Gravity
AJ Jackett
Jumper error. 99% of the time the reason the jumper dies or is injured is because they, the jumper caused a equipment failure or a misscalcualtion if it is a self bungee jump.
Gravity, rope, and friction
Well, it depends on what you mean. If you mean when they bungee jump, then it helps them not fall and it stretches to a distance there it will pull the bungee jumper up or to a certain height.
One should thoroughly research the equipment, safety measures and physical requirements involved before becoming a bungee jumper. Taking classes is recommended to avoid possible tragic consequences of being untrained.
Bungee jumping equipment would cost about one hundred dollars, depending on how intense you want to bungee jump. If you are a casual jumper, then it should cost about one hundred us dollars.
Useful energy would be the potential energy stored in the bungee cord when it is stretched out at the top of the jump, which is converted to kinetic energy as the jumper falls. Energy that is wasted would include any sound, heat, and other forms of energy dissipated as the bungee cord stretches and returns to its original length.
To explain this, you will need to keep in mind a mathematical formula: Force applied on bungee jumper = mass of bungee jumper x (initial speed - final speed) / time taken for change in momentum F = m x (vi - vf) / t Let's say the bungee jumper was falling at an initial speed of vi. If he was to be halted, the final speed, vf = 0. If he was halted very suddenly, i.e. in a short time, the value of Force applied on the bungee jumper would be very large, which would be dangerous. Now if he was to be halted gradually over a longer period of time, the value of the force applied on him would be smaller, slowly decelerating him until rest.
The oldest bungee jumper that I have seen documented, is Mohr Keel, who jumped at age 96, from the Bloukrans Bridge in South Africa. I have seen a claim on a bungee site, saying that the oldest bungee jumper was age 100, but I can only vouch for the 96 year old. You can see his jump at the following link: Best%20U%20Tube%20video%20links/The%20Worlds%20Oldest%20Bungy%20Jumper%20-%20CNN%20iReport.webarchive
smooth rocks create less friction on air.