Es gibt ja hier immer wieder Vertreter (Jörg), die die SI-Einheiten für unnötig und wenig sinnvoll halten. Das folgende stammt aus einer Fachzeitschrift mit peer-review (Sub- und Superschript waren im Original vorhanden und fielen dem Kopieren zum Opfer):
----------------------------------------------------------------------- The kinetic energy (KE) and momentum (P) of an arrow in flight explain its penetration. When a projectile is in flight, it has kinetic energy. This energy represents the amount of work the projectile can do as a result of its motion. After it strikes, the energy that transfers to the target represents the force of impact. The kinetic energy (KE) of a projectile is calculated by multiplying one-half of its mass by its velocity squared (1/2mv2). Mass is equal to the weight of the object (in pounds) divided by the pull of gravity (9.814 m/s/s). The unit of measurement for kinetic energy is foot/pounds (ft-lbs). Velocity significantly influences kinetic energy, while the mass of the object in motion exerts less effect (Hrdlicka 2003).
Many bow enthusiasts argue, however, that while kinetic energy determines how hard a projectile strikes, momentum determines how far that projectile penetrates the target. Momentum (P) is the tendency of an object in motion to stay in motion. Measured in slug feet per second (slug-ft/s), it represents the force of an object's forward movement. The momentum of a projectile is calculated by multiplying its mass with its velocity (P = mv). The calculation of momentum places equal value on the projectile's mass and its velocity.
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Im Gegensatz zur Zielgruppe bin ich mit Energie und Impuls wohlvertraut und kann das ganze beinah zurückübersetzen. Was "slug-feet" sein sollen bleibt aber schleierhaft, Füße habe ich weder an Nacktschnecken noch an Gewehrkugeln je gesehen.
Axel