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These resources include Tim’s on-orbit demonstrations of a ball on a tether and a ball in a circular track undergoing circular motion in various planes and the simple harmonic nature of displacement reduced to a single plane. Combined with the Earth based demonstrations of a cup of water travelling in a circle attached to a tether, and a loop the loop track, in-depth analysis of centripetal forces can take place. To find out more or to download the resources visit http://astroacademy.org.uk Comments are not enabled for this video as the National Space Academy will not be able to respond to them regularly. However, if you are using the Astro Academy: Principia videos in your classroom, or if you have any constructive feedback, please contact us http://astroacademy.org.uk/contact-us, or tweet us using the hashtag #TeachPrincipia

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