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Motion is always observed and measured [[relative]] to a [[frame of reference]]. As there is no absolute reference frame, ''absolute motion'' cannot be determined; this is emphasised by the term ''relative motion''.[http://www.colutron.com/download_files/chapt9.pdf]  

Motion is always observed and measured [[relative]] to a [[frame of reference]]. As there is no absolute reference frame, ''absolute motion'' cannot be determined; this is emphasised by the term ''relative motion''.[http://www.colutron.com/download_files/chapt9.pdf]  

A body which is motionless relative to a given reference frame, moves relative to infinitely many other frames. Thus, everything in the [[universe]] is moving.[http://www.nap.edu/html/oneuniverse/motion_20-21.html]  

A body which is motionless relative to a given reference frame, moves relative to infinitely many other frames. Thus, everything in the [[universe]] is moving.[http://www.nap.edu/html/oneuniverse/motion_20-21.html]  

<center>For lessons on the [[topic]] of '''''Motion''''', follow [http://nordan.daynal.org/wiki/index.php?title=Category:Motion '''''this link'''''].</center>

<center>For lessons on the [[topic]] of '''''Motion''''', follow [https://nordan.daynal.org/wiki/index.php?title=Category:Motion '''''this link'''''].</center>

==List of "imperceptible" human motions==

==List of "imperceptible" human motions==

[[Human]]s, like all [[things]] in the universe are in constant motion,[http://www.nap.edu/html/oneuniverse/motion_8-9.html] however, aside from obvious movements of the various external [[body]] parts and locomotion, humans are in motion in a variety of ways which are more difficult to [[perception|perceive]].  Many of these "imperceptible motions" are only perceivable with the help of special tools and careful observation. The larger scales of "imperceptible motions" are difficult for humans to perceive for two reasons: 1) Newton's laws of motion (particularly [[Inertia]]) which prevent humans from feeling motions of a [[mass]] to which they are connected, and 2) the lack of an obvious [[frame of reference]] which would allow [[individual]]s to easily see that they are moving.[http://www.physlink.com/education/askexperts/ae118.cfm]] The smaller scales of these motions are too small for [[human]]s to [[sense]].  

[[Human]]s, like all [[things]] in the universe are in constant motion,[http://www.nap.edu/html/oneuniverse/motion_8-9.html] however, aside from obvious movements of the various external [[body]] parts and locomotion, humans are in motion in a variety of ways which are more difficult to [[perception|perceive]].  Many of these "imperceptible motions" are only perceivable with the help of special tools and careful observation. The larger scales of "imperceptible motions" are difficult for humans to perceive for two reasons: 1) Newton's laws of motion (particularly [[Inertia]]) which prevent humans from feeling motions of a [[mass]] to which they are connected, and 2) the lack of an obvious [[frame of reference]] which would allow [[individual]]s to easily see that they are moving.[http://www.physlink.com/education/askexperts/ae118.cfm]] The smaller scales of these motions are too small for [[human]]s to [[sense]].