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00:40 IWF (Göttingen) German 2003

Langsam ablaufender elastischer Stoß

Elastic collision between two bodies in slow motion through the proper choice of the experimental conditions. It will be shown that during the collision the kinetic energy is briefly converted into potential energy and then back into kinetic energy. The slow collision, achieved through the proper choice of masses and spring constants, demonstrates clearly the transformation from kinetic to potential energy, and back again, as is characteristic for elastic collisions. This experiment also demonstrates the conservation of linear momentum.
  • Published: 2003
  • Publisher: IWF (Göttingen)
  • Language: German
00:44 IWF (Göttingen) German 2003


According to the law of the conservation of momentum, which states that in every closed system the sum of the individual momenta stays constant. They can be exchanged inside the system. Three examples will be shown. In all three cases, the total momentum of the closed system remains constant.
  • Published: 2003
  • 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
01:04 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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