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For a good view of all the demos please sit near the front (ie front 5 rows)

Join Dr. Hugh Hunt from Cambridge University as he explores the fascinating world of boomerangs, bouncing balls, and other spinning things. Learn about the gyroscopic effect and how it affects objects in motion. Discover the physics behind boomerangs and how they generate lift. Sit near the front for the best view of the demonstrations!

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For a good view of all the demos please sit near the front (ie front 5 rows)

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  1. For a good viewof all the demosplease sit nearthe front(ie front 5 rows)

  2. BoomerangsBouncing Ballsandother spinning things Dr Hugh HuntCambridgeUniversityEngineeringDepartment Trinity College Cambridge

  3. Bouncing balls

  4. Spinning and Rolling the gyroscopic effect

  5. The Gyroscopic Effect • Coffee grinder • Angle grinder • Hair drier For details go to www.hughhunt.co.uk

  6. Circular motion force mass speed string

  7. 1: ballet dancers and ice skaters Moment of Inertia J : “an Angular Mass” Arms in, FeelLight J J w w SpinFAST Conservation of Angular Momentum J w Arms out, feelHeavy Spin slowly

  8. 2: pointing the Hubble Telescope   Still no spin ! No spin Conservation of Angular Momentum Jw

  9. 3: spinning in space     Conservation of Angular Momentum Jw

  10. The Gyroscopic effect C Precession C Couple W C w C SPIN (Angular momentum) C = J w W J = moment of inertia of wheel

  11. Air deflected downwards Air flow Lift force How Wings Work F V

  12. Boomerangs C Precession C Couple more lift faster Direction of travel Spin C slower less lift

  13. Physics of boomerangs 4J rCLpa4 where R = path radius J = moment of inertia r = air density CL = lift coefficient a = size of boomerang R = ________ andaw = 2 V flick-of-the-wrist w = boomerang spin V = boomerang velocity

  14. Boomerangs come in many shapes and sizes. They make great christmas presents!

  15. The End www.hughhunt.co.uk Google: Hugh Hunt Boomerangs Trinity College Cambridge www.trin.cam.ac.uk Cambridge University Engineering Dept www.eng.cam.ac.uk

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