All motion is relative to a frame of reference. A simple demonstration showing this to be true. Content Times: 0:21 The demonstration 1:22 A second, similar demonstration Multilingual? Please help translate Flipping Physics videos! http://www.flippingphysics.com/translate.html Next Video: Introduction to Relative Motion using a Quadcopter Drone http://www.flippingphysics.com/introduction-to-relative-motion.html Previous Video: Demonstrating the Components of Projectile Motion http://www.flippingphysics.com/components-of-projectile-motion.html Thank you very much to Chris Dupont for letting me use my recording of “Starting Fires” from his show at The Ark on 2013/11/14. http://www.chrisdupontmusic.com 1¢/minute: http://www.flippingphysics.com/give.html