The Scrum's Work
The scrum is the most dangerous sequence in a sport out of all the sports in the world, and that is because of the amount of energy created during this play. It is two packs of eight players, exploding with all their muscle towards each other in an effort to push the opposing team back. According to the data collected by Sports Science, a scrum generates, on average, 13 350N of force! This is an immense amount of energy. But even so, there is surprisingly little to no work done during the scrum. Work is defined as change in energy, or the net force multiplied by the distance. This means that the only significant work done is when the two sides close the gap of 50cm between each other while engaging. W = Fd W = 13 350N(0.5m) W = 6 675J (both sides combined) However, after the initiation and engagement the scrum rarely moves much in either direction which means the net force is extremely close to 0, and therefore creates no work. Power Power is simply the amount of work over a given time which is measured in Watts. There is obviously no power during the scrum due to the minimal work being done, however the short burst of energy at the beginning has a great amount of power. The combined 6 675J of work done over a span of 0.2 seconds creates a whopping 33 000 watts! P=W/t P=6675J/0.2s P=33 375W |
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Conservation of energy
The diagram to the left briefly describes how energy is transferred. The Law of Conservation of Energy states that energy may never be created or lost, but only transferred into different types. This means that the amount of energy you consume as food (in calories) will be the max amount of Joules you will use for the rest of your activities.
For the given example, this law will mean that the exact number of joules taken in as food will equal the total amount of joules for sound, kinetic and heat. All the energy in will equal all the energy out.
And this creates a cycle of energy that never ends, as it is just constantly being transferred or stored.
For the given example, this law will mean that the exact number of joules taken in as food will equal the total amount of joules for sound, kinetic and heat. All the energy in will equal all the energy out.
And this creates a cycle of energy that never ends, as it is just constantly being transferred or stored.