1.read the article here
2. click "comments" and where it says "comment as" select "anonymous" from drop down menu, in your comment be sure to include full name and period
2. post a comment that both summarizes the article and relates it to chapter 18 and 19 material, be sure to make connections between the article and what you are learning,
just summarizing will not gain you full credit.
Comment is due by Monday May 16 by 8am sharp.
Logan Matagi( period 4): after reading the article I learned that when runners take a turn on the track, they tend to slow down because of gravity and centripetal force . Also, amputees that participate in the paralympics that have amputated their left leg higher than their ankle are at a disadvantage. Reasons for this is because they are putting much force into thier inside leg (which is amputated) that they tend to slow down.
ReplyDeleteMorgan Capillan PERIOD 4)) After reading this article i have an idea why paralympic ankles have hard time running on the curves of the track because how the ankle is created. The paralympic legs doesnt have alot of friction between the track and ankle. The paralympic is shaped as a J limb. THeres a lack of static friction because the paralympic legs doesnt absorb the force of the body weight of the sprinter.
ReplyDeleteAfter reading this article I learned that on curves in Olympic running events runners tend to slow down because of the change in velocity, and also runners with prosthetic legs slow down even more when they get to curves because their prosthetic leg can't apply as much force as a real leg so to get rid of that problem they swing their legs to advance more faster.
ReplyDeleteShawnee Greene-Duarte (Period 5)
ReplyDeleteAny runner struggles with curves because as their velocity changes they are slowed down by gravity and centripetal force. When coming around a curve, runners are believed to put more force on their outside foot and less on the inside foot. A person with a prosthetic limb on the inside runs slower than a person with one on the outside. The J shaped prosthetic limb can't create as much force as a real one, and amputee runners have to make for this by swinging their legs faster. When an object, or in this case a person, changes velocity the forces are not balanced. Runners with prosthetic limb on the inside have a disadvantage because the forces are too unbalanced since the inside leg does not generate enough force, slowing them down.
while i was reading this article i realized that while these sprinters are running and they are coming up on the turn then there are two forces in play. both which are slowing the runner down. Also that most paralympic runners wear legs that obsorbs and release energy.
ReplyDeleteKason Latu (Period 6). After reading this article I learned that two important forces are in play when a sprinter gets to the curve. First, working against gravity slows a runner and the centripetal force is at work too. The centripetal force pulls something on a circular path toward the center of the curve. Predicting that the runner will slow down.
ReplyDeletewhen I read the article it talks about how runners have to fight two forces when they go around cruves and I also found out that the fake legs can give out massive amount of energy.
ReplyDeleteTeylor Andrade (Period 6). In this article i learned that running around curves often tends to slow a runner down. But for people with a prosthetic leg it tends to slow them down more. While running the play of force and centripetal force is at work often slowing them down alot. All in all people that have a prosthetic leg have more of a hard time running cause its the bend or curve and the forces working upon with it is slowing it down.
ReplyDeleteGloria Filipo-Maiava (Period 7)
ReplyDeleteI learned that an artificial leg slows the sprinter down every time they turn a corner. They lose more speed going around a corner when their affected leg is on the inside or the corner rather than the outside leg. Corners tend to slow people down. It's even harder for amputees using artificial limbs. Any leg the prosthesis is on can affect how fast can take a turn. Working against gravity slows a runner down. Centripetal pulls something on a circular path towards the center of the curve which slows a runner down too. The inside leg creates less force than the outside leg. Most amputee sprinters wear J-Shaped prosthetic limbs that absorbs and releases energy, much as an ankle. They swing their legs faster to make it up. Prostheses that's on the inside of a turn also decreased the speed of their steps. Paralympic races always go counter clockwise so amputees whose artificial leg is on the left have more advantage.
Vili Fisiiahi (Period 6)
ReplyDeleteWhat I learned from reading this passage is that, Runners with prosthetic legs have a a lot harder time going around the track curve then regular humans do. They have 2 forces that are involved into there running, you have gravity and then have centripetal force. Most amputee runners wear J shaped legs because it absorbs and releases energy like an ankle. For that reason they have to swing there legs a lot more faster to make it up.the prostheses that's on the inside of there body also decreases the speed in there steps paralympics raves sometimes g9 COUNTER CLOCKWISE so the people whose artificial leg is on the left have a advantage as well.
Talei Niu (period 4)
ReplyDeleteAfter reading the article, I learned that people without prosthetic legs naturally have some sort of difficulty making curves on a track. So those with prosthetic legs have an even harder time. Their prosthetic legs don't absorb weight and shock as good as normal ankles. Also, a prosthetic leg isn't flexible or able to rotate a shift with the curve of the track like a normal ankle. Because of this they have a harder time running the curve and need to stop to make the curve.
Phaidra Michael (period 7)
ReplyDeleteAfter reading the article I learned that curve tend to slow down even the humen runners so for those who have the prosithic limb its even more difficult. Two forces come into play when the runner goes around the curve: gravity and centripetal. Someone with an prosithic limb slows down 3.9% slower then someone with a human ankle, probably because of its J shape. The J shape limb can absorb and release energy but it cant create force, so they swing their legs to make them move faster.
Viceson Galeai (period 7)
ReplyDeleteI learned from this article that curves on a track slow down runners, it is even harder for amputees that wear artificial limbs. The two forces that play an important role when a runner goes around a bend are gravity and centripetal force. When a runner runs around a bend the inside leg doesn’t create as much force as the outside one. A lot of the amputee runners wear a J-shape prosthetic limb. It is better at absorbing and releasing energy almost like a person with a regular ankle does. But it still does not create the same amount of force as a real ankle does so the amputees try to make up the force by swinging their legs faster. This article relates to chapter 18 and 19 because being a successful track runner depends on the the amount of force the runner has to create energy and the motion that the runner has.
Madeline Wihongi (period 4)
ReplyDeleteIn this article it talks about how curves on a track can cause a runner to slow down and also someone who has an artificial limb. The University of Colorado at Boulder decided to test this theory based on their studies that when a runner curves around a bend the inside leg has a decreased or lower force than the outside leg. The university specialist had amputee runners and non amputee runners lap around a track clockwise and counterclockwise. After all this data was collected they found that runners on the outside curve were 3.9% faster than those on the inner curve. In class were talking a lot about force and the definition of force is a push or pull on an object resulting from the objects interaction with another object. So when were talking about force on a curve of a track, were talking about the gravitational force which we are running against and as the article said the centripetal force which pulls or running direction to the center of the curve therefore changing our velocity. These two forces are ultimately the cause for why a runner slows further down on a curve whether they are on a prosthetic limb or not they will slow down.