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The Spinning Top Chloe Elliott
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Rigid Bodies Six degrees of freedom: 3 cartesian coordinates specifying position of centre of mass 3 angles specifying orientation of body axes Distance between all pairs of points in the system must remain permanently fixed
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Orthogonal Transformations General linear transformation: matrix of transformation, elements a ij Transition between coordinates fixed in space and coordinates fixed in the rigid body is achieved by means of an orthogonal transformation
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Euler Angles Transformation matrices:
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Euler Angles Transformation matrices:
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Euler Angles Transformation matrices:
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Euler’s Theorem “any transformation in the 3-dimensional real space which has at least one fixed point can be described as a simple rotation about a single axis” Chalses’ Theorem “the most general displacement of a rigid body is a translation plus a rotation”
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Moment of Inertia Relationship between angular momentum and angular velocity: Principal moments I 1, I 2, and I 3 found easily if coordinate axes chosen to lie along the directions of the principal axes I : moment of inertia tensor
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Euler’s Equations of Motion For rigid body with one point fixed: : net torque that the body is being subjected to
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Force Free Motion of a Rigid Body Euler’s equations for a symmetric body with one point fixed, subject to no net forces or torques: Angular frequency:
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Heavy Symmetrical Top – One Point Fixed Generalised momenta corresponding to ignorable coordinates:
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Heavy Symmetrical Top ctd. Energy equation: |ƒ(u) | ∞ as u ∞ ƒ( ±1) = – (b + a) 2 ≤ 0 _
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Heavy Symmetrical Top ctd. Three possibilities for the motion: Motion in : precession Motion in : nutation
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Questions
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