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00:50 IWF (Göttingen) German 2004

Kräfte im elektrischen Feld

Between two surfaces separated only by a small gap, small voltages can lead to appreciable forces.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
02:28 IWF (Göttingen) German 2004


It will be shown that in a small electromagnet surprisingly large forces can be generated. However, these forces decrease drastically with the introduction of only a small gap between the pole faces.
  • Published: 2004
  • Publisher: IWF (Göttingen)
  • Language: German
01:08 IWF (Göttingen) German 2003

Elastische Verformung: Hookesches Gesetz

A demonstration of the proportionality of tension and elongation during elastic deformation of a metal wire (Hooke's law). A copper wire, 4.4 m long, 0.4 mm in diameter, is suspended from the ceiling of the lecture hall. For the measurement of its elongation, a mm scale is attached to its lower end and is projected onto a screen, together with a fixed pointer. The wire is pulled in two steps by attaching consecutively two 300 g weights. The total elongation measured is 1 mm for 300 g, and 2 mm for 600 g, and is shown to be fully reversible when the weights are removed, indicating an elastic deformation. Elongation and force are proportional, in compliance with Hooke's law.
  • Published: 2003
  • Publisher: IWF (Göttingen)
  • Language: German
01:04 IWF (Göttingen) German 2003

Kraft = Gegenkraft

A demonstration that forces between two bodies always occur in pairs: They are opposite in direction and equal in magnitude. These facts were summarized by Newton with the statement "action = reaction". Two people are standing on flat carts on a level floor, a few meters apart. The forces are exerted by means of a rope. The experiment shows that in both cases the forces are equal in magnitude and opposite in direction, in short: action = reaction. It also shows that the total momentum of the system is conserved.
  • Published: 2003
  • Publisher: IWF (Göttingen)
  • Language: German
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