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@article{622646, author = {Bartoš, Jiří and Musilová, Jana}, article_location = {GB}, article_number = {27}, keywords = {damping; force; oscillator; drag; Newton; Stokes; experiment}, language = {eng}, issn = {0143-0807}, journal = {European Journal of Physics}, title = {Damping forces - a friend or a foe in explaining mechanical motion?}, url = {http://physics.muni.cz/~bartos/resdemexp.html}, volume = {2006}, year = {2006} }
TY - JOUR ID - 622646 AU - Bartoš, Jiří - Musilová, Jana PY - 2006 TI - Damping forces - a friend or a foe in explaining mechanical motion? JF - European Journal of Physics VL - 2006 IS - 27 SP - 383-392 EP - 383-392 PB - European Journal of Physics SN - 01430807 KW - damping KW - force KW - oscillator KW - drag KW - Newton KW - Stokes KW - experiment UR - http://physics.muni.cz/~bartos/resdemexp.html N2 - The paper presents simle, cheap, easily accessible and for students impressive demonstration experiments for three typical examples of physical systems for which damping forces ought to be involved in the equations of motion: a body falling in air, a damped mechanical oscillator, and Foucault currents. Various models of such forces are studied within an elementary physical and mathematical approach. It appears, maybe as a slightly suprising result that a commonly used model of damping forces in mechanics - the air drag force linearly depending on velocity - is not realistic in many typical situations. Equations of motion are solved numerically with standard software packages even in cases where an analytical solution exists. Thus, the explanation of solved problems is on a level corresponding to an undergraduate university course of general physics. The results of these demonstration experiments are compared with graphical outputs of numerical solutions. ER -
BARTOŠ, Jiří a Jana MUSILOVÁ. Damping forces - a friend or a foe in explaining mechanical motion? \textit{European Journal of Physics}. GB: European Journal of Physics, 2006, roč.~2006, č.~27, s.~383-392. ISSN~0143-0807.
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