https://www.youtube.com/
http://www.physicsclassroom.com/class/newtlaws/Lesson-2/The-Meaning-of-Force
https://thescienceclassroom.wikispaces.com/Physics+of+Soccer
http://physicsinsports.weebly.com/objects-in-motion.html
http://www.physicsclassroom.com/class/newtlaws/Lesson-2/The-Meaning-of-Force
https://thescienceclassroom.wikispaces.com/Physics+of+Soccer
http://physicsinsports.weebly.com/objects-in-motion.html