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01:21 IWF (Göttingen) German 2003

Bestimmung des elektrischen Erdfeldes

The electric field of the earth will be determined. A parallel plate capacitor of area 1 m2 is attached to the end of a long bamboo pole. The capacitor is connected to a ballistic galvanometer calibrated to measure current pulses (charges). On a balcony outside the lecture hall, the capacitor is held with its plates horizontal.
  • Published: 2003
  • Publisher: IWF (Göttingen)
  • Language: German
07:36 IWF (Göttingen) German 2004

Stromlinien-Modellversuche

The goal is the demonstration of two-dimensional streamline patterns as they occur when non-viscous fluids flow around obstacles. The patterns shown are models, since they have been produced in a viscous fluid under conditions of laminar flow.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:59 IWF (Göttingen) German 2004

Maxwellsche Scheibe

A body that is being accelerated downward weighs less than when at rest. This is demonstrated with a flywheel on a shaft suspended on one arm of a household scale (Maxwell's disk). It is suspended on one arm of the scale with two strings which wrap around the thin shaft. When the flywheel is released, it accelerates downward, and the scale reads a reduced weight. During the subsequent rise (the flywheel still accelerating downward!) the scale again indicates a reduced weight.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
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
01:22 IWF (Göttingen) German 2003

Zirkulare Schwingungen

Through superposition of the linear oscillations of two leaf springs of almost equal frequencies, linear, elliptic and circular oscillations can be generated and shown by optical projection.
  • Published: 2003
  • Publisher: IWF (Göttingen)
  • Language: German
06:26 IWF (Göttingen) German 2004

Wasserwellenexperimente

Some of the fundamental properties of waves are demonstrated using surface waves in a water trough.
  • Published: 2004
  • 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
01:28 IWF (Göttingen) German 2004

Modell einer fortschreitenden Welle

The connection between circular motion, phase difference and wave propagation is shown with the help of a series of beads arranged to form a right-handed helix.
  • 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
01:35 IWF (Göttingen) German 2004

Behnsches Rohr

A balloon filled with a gas lighter than air will rise. This is explained as evidence that the pressure in the heavier air decreases more rapidly with increasing height than that of the lighter gas inside the balloon.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:29 IWF (Göttingen) German 2003

Freier Fall

Free fall as an example for a movement with a constant tangential acceleration.
  • Published: 2003
  • 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
01:00 IWF (Göttingen) German 2004

Kugeltanz

A steel ball is dropped onto a heavy steel plate. It collides elastically with the plate and rises almost back to its initial height, whereupon the motion repeats itself periodically, with an amplitude determined by the initial height. The total force acting on the ball is highly nonlinear. Energy dissipation leads to a slow decrease of the mechanical energy, and thus of the amplitude, as the experiment progresses. At the same time, the frequency increases
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:50 IWF (Göttingen) German 2004

Bestimmung einer Geschossgeschwindigkeit

The large velocity of a bullet is determined using only a simple pendulum together with the knowledge of its motion, and the law of the conservation of momentum.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:33 IWF (Göttingen) German 2004

Lissajous-Bahnen

Lissajous figures are created and made visible with bending vibrations with different frequencies in two perpendicular directions, using a metal bar of rectangular cross section which is clamped at one end and carries a mirror at the other, off which a light beam is reflected.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:20 IWF (Göttingen) German 2004

Schwingungen einer Stimmgabel

The sinusoidal vibrations of a tuning fork are made visible by means of a reflected light beam. The tuning fork is excited by compressed air, and can be rotated around its vertical axis. One of its legs carries a small mirror off which a laser beam is reflected onto the wall. By uniformly rotating the tuning fork, the time dependence of its vibration can be demonstrated.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:53 IWF (Göttingen) German 2004

Transversale Eigenschwingungen eines Gummibandes

A rubber band clamped at its two ends can be excited to a large number of normal modes of transverse vibrations. These modes can also be described as superposition of two equal waves travelling in opposite directions, forming standing waves.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:21 IWF (Göttingen) German 2004

Rauchringe

Vortex rings are a remarkably stable form of moving gas. They are being made visible with cigarette smoke. They are shown to travel rapidly over many meters, and can even extinguish a candle.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:41 IWF (Göttingen) German 2004

Ausweichströmungen

Fluid flow around several objects and the effect of viscosity are shown in a two-dimensional apparatus. Aluminum tinsel has been added to the fluid to indicate locally the instantaneous direction and magnitude of the velocity of the fluid.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:08 IWF (Göttingen) German 2004

Modellgas und barometrische Dichteverteilung

Random (thermal) motion of gas molecules is simulated using small steel spheres in a container with moving walls. The density distribution in the gravitational field is shown for this model gas.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:56 IWF (Göttingen) German 2004

Wackelschwingungen

The sinusoidal vibrations of a tuning fork are made visible by means of a reflected light beam. The tuning fork is excited by compressed air, and can be rotated around its vertical axis. One of its legs carries a small mirror off which a laser beam is reflected onto the wall. By uniformly rotating the tuning fork, the time dependence of its vibration can be demonstrated.
  • 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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