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Notes
- 1.
For internal friction (viscosity), cf. Sect. 10.2.
- 2.
It consists of 90 % Pt and 10 % Ir (wt.-%) and is kept at Sèvres, near Paris. See also http://www.bipm.org/en/publications/mises-en-pratique/kilogram.html.
- 3.
The word ‘weight’ inevitably reminds those who are not steeped in physics of a property of the object instead of a force acting on it. This makes it more difficult to realize that these forces come about through the effect of the earth (or e.g. of the moon if the object were located on the lunar surface).
- 4.
The use of the word mass in the place of ‘body’ or ‘object’ is apparently ineradicable. Over and over, one finds for example a ‘mass’ hanging on a string, rather than a body, i.e. instead of the object, one of its properties! In English, the word ‘weight’ is used in a similar way: a ‘weight’ is hanging on a string, rather than a body with a certain weight. This is, however, officially tolerated by the SI.
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Lüders, K., Pohl, R.O. (2017). Fundamentals of Dynamics. In: Lüders, K., Pohl, R. (eds) Pohl's Introduction to Physics. Springer, Cham. https://doi.org/10.1007/978-3-319-40046-4_3
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