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The Bouncing Spring.

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The Bouncing Spring


Imagine someone doing a bungee jump or someone bouncing on a trampoline and think what is it that keeps pulling them down and not letting them fly off, Gravity the most important force on Earth. What if we didn’t have gravity, everyone would be jumping through the air, and people would take more than just one second to fall. Gravity helps objects fall and even if they intend to rise again due to a gain of energy such as elastic, that energy is converted into gravitational energy and this process keeps on going until gravity starts to become more powerful than the energy provided to keep the object up.

My aim of this piece of coursework is to find out about the relationships between springs, gravity and weight.  I must use as much scientific evidence as possible to prove whatever variables may occur.

 Here are some variables for me to consider:

  1. Counting the number of bounces and recording the times along with different weights.
  2. Timing different number of bounces, using only the same amounts of weights.
  3. Using longer springs and different weights and timing a fixed number of bounces for each trial.

Out of these three variables, I wish to choose the first due to that it seems to give out a bigger variety of results and as well as that, should be more interesting to do with the increase of weights per trial.



1 x crane

1 x spring

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If the spring I am using seems to look a bit overstretched, I will immediately use a new spring due to that the overstretched spring would let the weights take longer to bounce, causing an unfair test.Another important variable I must take into consideration is the bounces and that I have to be accurate in counting them or otherwise the time could increase or decrease so I’ve decided to count the bounce just before the weight/s spring/s back up.

My prediction

I predict that the more weights used, the longer it will take bounce because in my general terms the stronger the weight with the more energy, the more gravitational energy produced (converted from the elastic energy) and this will convert back to the original energy and at first, the weight will use a great deal of gravitational energy, the weights will drop deeper and will take longer to cause one bounce.

 I searched on the internet for a scientific prediction and came up with Hooke’s Law and it came up with that the spring has a certain stretching limit/elastic limit which can be obtained by using lots of weights or leaving weights in a still position on the spring.

Preliminary Work

I did a practice practical before I’m going to the main one to see whether the results are suitable enough to proceed onto the main practical.

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 My prediction has been proved (the more weight, the longer it takes to break) and from looking at the graph, I can see that the time rising after every weight from 100g-500g.


Overall, I think the results seemed to be quite exact to my predictions and also I proved my prediction by using Hooke’s Law. When I plotted the averages on the graph, all the the data seemed to be quite reasonable except for the 200g data and it seemed that it wasn’t as close to the line of best fit in comparison to all the other data. Maybe if I did a retest I might’ve made new and better results or maybe even worse results.

 One reason why I obtained poor evidence such as the 200g test was possibly because the weights didn’t bounce straight and seemed to swing in the form of a pendulum; also with the heavy amounts of weights on the spring, they intended to hit the table which possible quickened the time but I noticed this on the preliminary work so I took precautions and made the weights bounce off the table and ended up doing fine. Maybe if I used the same method with all the other weights my results could’ve been better but in my own opinion I doubt it because firstly gravity is the same no matter how high or how low you are and secondly the lighter weights didn’t hit the table, not causing an unfair test.

 My conclusion seemed to be quite straight with no strange readings

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