Quote:
Originally Posted by jawn
When you clutch in, you've decreased the moment of inertia. Angular momentum is conserved. Angular velocity increases. No force or energy needs to be added to the system to cause a rise in angular velocity.
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Angular momentum is conserved. When you clutch in, the complete assembly, which is now disconnected, is also still spinning, except in multiple pieces. The sum of the momentum of the multiple pieces, is still the same as the sum of the pieces connected.