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tjpapaleo

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  1. tjpapaleo

    Football 2.0

    By tjpapaleo,

    So today we will be going back to the topic of football and looking at another aspect in the game. We will be looking at the kinematics of a quarterback throwing a football. So when you see a quarterback throw a football, how fast do you think they need to throw it? You can use kinematics to find that. So being the quarterback, you guesstimate that he will run 50 meters in 6 seconds. You know that halfway, the velocity in the vertical direction is 0 and at the start, it is also 0. So knowing that you can find the horizontal initial velocity with the distance = 50, the acceleration 0, the time 6, and final velocity is not needed. Using the equation Δx = Vo(t) + .5at^2 to get the initial velocity. And also doing the same for the vertical initial velocity, you now have the components of velocity. Set up a right triangle and use Pythagoras thereom to find the velocity of the football the quarterback would need to throw. I don't think a quarterback has enough time to do that all in his head but you never know. That's our second time visiting the physics of football. Tune in next time for more exciting physics work. 
  2. tjpapaleo

    Running

    By tjpapaleo,

    So since I've participated in a sport of running called Cross Country, I think I might talk about the physics I'm doing everyday. Let me "run" you through the basics one "step" at a time! I need to stop hanging out with      Briana. So anyways, everyone hates running, but why? Well, because everytime you step, you exert a big force to the ground and the ground pushes back with an equal and opposite force (Newton's 3rd Law). This pounding on your legs, mainly knees and calves, causes pain in the areas that get the biggest force. Also, you may not believe it or feel it, but air resistance or drag force plays a major role in how fast you may run. So as you know, drag force = -bv, meaning that as you increase your speed,  you increase the amount of air resistance acting on you. If you want to increase your speed by 2 miles, you have to work twice as hard to beat drag force. So that's all on running for today. Tune in next time where we hit more everyday physics. 

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