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00:54 IWF (Göttingen) German 2004

Schwanke Achse

An object rotates stably around its axis of maximum moment of inertia, even if it is attached to a bent supple shaft. The experiment also shows that particles leave a rotating object by flying off in a tangential direction.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:42 IWF (Göttingen) German 2003

Drehstuhlexperimente zur Erhaltung des Drehimpulses

Conservation of angular momentum around the vertical axis of a rotating chair. A man sitting on a rotating chair with very little friction uses weights, a spinning wheel, and a wooden hammer with a long handle to demonstrate the vector nature of the angular momentum as well as its conservation in the absence of external torques. This setup allows to limit the observation to a single (the vertical) component of the angular momentum.
  • Published: 2003
  • Publisher: IWF (Göttingen)
  • Language: German
02:25 IWF (Göttingen) German 2004

Rotation um freie Achsen

It will be shown that the axis of maximum moment of inertia is also the most stable axis of free rotation. For this, objects of different shapes are suspended on thin wires from the vertical axis of an electric motor, and are rotated at increasing frequencies. They are a cylindrical metal rod, a piece of wood in the form of an egg, and a loose loop of a metal chain.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:10 IWF (Göttingen) German 2004

Freie Rotation eines quaderförmigen Körpers

Only the axes of maximum and minimum moment of inertia are free axes of rotation around which a body can rotate stably without mechanical support. Attempts at rotation around other axes lead to wobbling, i.e. unstable rotation. A piece of styrofoam in the form of a parallelepiped (like a cigar box) is thrown into the air while giving it a spin. In order to watch the motion, opposing surfaces have been marked with different colors.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:19 IWF (Göttingen) German 2004

Zur Physik des Turnens mit Schwüngen

Using a torsional oscillator, it will be shown how its amplitude can be increased without external torques, merely by correctly timed variations of the moment of inertia, which requires work. This is the principle of setting a swing in motion, or of swinging on the high bar. The oscillator used is a rotating stool with a helical spring. The experimenter on the stool changes the moment of inertia by alternating his position from sitting to prone.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:03 IWF (Göttingen) German 2004

Trägheitsmomente

The moment of inertia of a body is determined by its mass and its distribution relative to the axis of rotation. An experimenter assumes different positions on the stool which has been converted to a torsional oscillator, and its period of oscillation is determined. From this measurement the moment of inertia can be obtained, and is found to differ by almost an order of magnitude for different positions.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:44 IWF (Göttingen) German 2004

Drehpendel auf einem Karussell

A torsional pendulum on a rotating table is an instructive example of inertial forces in accelerated reference frames.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
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