Energy/work and power
-Energy is the ability of a physical system to do work on other physical systems. It is measured in Joules. (J)
-A force is said to do Work when it acts on a body so that there is a displacement, however small, in the direction of the force. Work is measured in Force times Distance. (W=F*D)
-Power is the rate at which energy is transferred, used, or transformed. The unit of power is Joules per second (J/s).
Energy is a crucial part of any sport. When watching rugby, you see energy being transferred everywhere in order to perform different things, whether its jumping to make a catch or running to get the try. Work is what a force does when it acts on the body and creates displacement in the same direction as the force. Work is constantly being done in rugby when players run from one place to another or a player gets moved back by getting tackled. And lastly, power is the rate at which energy is transferred meaning how fast you can transfer energy, for example, a wing will be able to generate power the quickest due to their speed while a bigger player will not be able to do so as efficiently.
Energy, and the transfer of energy, is a crucial part of any sport. Energy itself, is the ability of a physical system to do work on other physical systems. When watching football, you can see energy being used and transformed to preform different abilities all over the field, whether it is jumping up for a ball, or making a tackle. Work, is what a force does when it acts on a body and creates a displacement in the same direction of the force. Work is being done on the football field all the time, when O-linemen push defenders around, and displace them, in order to create a clear path for their running back. Finally power, is just the rate at which energy is transferred. Power is just how fast you can transfer energy, for example powerful running backs with big legs can generate the power to explode into their full stride run a lot faster than a kicker can. They can transfer the energy must quicker.
-A force is said to do Work when it acts on a body so that there is a displacement, however small, in the direction of the force. Work is measured in Force times Distance. (W=F*D)
-Power is the rate at which energy is transferred, used, or transformed. The unit of power is Joules per second (J/s).
Energy is a crucial part of any sport. When watching rugby, you see energy being transferred everywhere in order to perform different things, whether its jumping to make a catch or running to get the try. Work is what a force does when it acts on the body and creates displacement in the same direction as the force. Work is constantly being done in rugby when players run from one place to another or a player gets moved back by getting tackled. And lastly, power is the rate at which energy is transferred meaning how fast you can transfer energy, for example, a wing will be able to generate power the quickest due to their speed while a bigger player will not be able to do so as efficiently.
Energy, and the transfer of energy, is a crucial part of any sport. Energy itself, is the ability of a physical system to do work on other physical systems. When watching football, you can see energy being used and transformed to preform different abilities all over the field, whether it is jumping up for a ball, or making a tackle. Work, is what a force does when it acts on a body and creates a displacement in the same direction of the force. Work is being done on the football field all the time, when O-linemen push defenders around, and displace them, in order to create a clear path for their running back. Finally power, is just the rate at which energy is transferred. Power is just how fast you can transfer energy, for example powerful running backs with big legs can generate the power to explode into their full stride run a lot faster than a kicker can. They can transfer the energy must quicker.
conservation of energy
The Law of Conservation of Energy states that energy may never be created or lost, but only transferred into different types. This states that all the food you consume will be all the energy you have and it will be transferred throughout your body. Which means the amount of Joules you take in as food will be the entire amount converted into sound, heat, and kinetic energy. All the energy you intake will equal the amount you release and this creates a never ending energy cycle where energy is continuously transferred or stored.
The diagram on the right is an example of energy being transferred throughout your body. Starting with the food you eat and ending with the sound, heat, and kinetic energy.
The diagram on the right is an example of energy being transferred throughout your body. Starting with the food you eat and ending with the sound, heat, and kinetic energy.
a scrum
A scrum in rugby is arguably the most dangerous thing you can come across in team sports, this is because of all the energy that is exerted by the players in this play. A scrum is a pack of 8 players from both teams using all of their muscle to try and push the other team as far back as possible. Sports Science did a piece on this specific play and they came to a conclusion that, on average, a scrum generates over 13,300 N of force! This amount of energy is ridiculous and is un-comparable by any other sport. But even with all of this force, there is little or no work being done in this play due to the fact that work is defined as a change in energy, or the net force multiplied by the distance, and since there is no change in energy and not very much distance that they cover, the amount of work is close to 0. The only significant amount of work being done occurs right at the start of the scrum when both teams attack each other from a distance of 50 cm.
W = Fd W = 13 350N(0.5m) W = 6 675J (both sides combined)
After the initial movement in a scrum, it rarely moves anywhere which means the net force is extremely close to 0, thus creating no work.
W = Fd W = 13 350N(0.5m) W = 6 675J (both sides combined)
After the initial movement in a scrum, it rarely moves anywhere which means the net force is extremely close to 0, thus creating no work.
power
Power is the amount of work being done over a certain period of time. In a scrum, there is not much power because of the minimal amount of work being done, but at the start of the scrum during the quick explosion of energy from both teams there is ample amounts of power from all the work that is done. The combined 6,675 J over the short span of 0.15s that it takes to cover the small amount of space creates a massive 44,500 Watts of power!
P=W/t P=6675J/0.15s P=44,500W
P=W/t P=6675J/0.15s P=44,500W