Talk:Q2643095

Autodescription — rolling (Q2643095)

description: type of motion that combines rotation and translation of an object with respect to a surface with which it is in contact

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Classification of the class rolling (Q2643095)  

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@Swpb: did you learn mechanics? Rolling is rotation (relatively touch poing) at any particular time. --Infovarius (talk) 20:20, 3 October 2019 (UTC)[reply]

I'm an engineer, so yes, but this isn't a matter of mechanics, but semantics. Rolling has two vital parts: rotation and translation. Remove either part, and it isn't "rolling" anymore. If A is a combination of B and C, it cannot be a subclass of B. Swpb (talk) 13:15, 4 October 2019 (UTC)[reply]

Not semantics, but frame of reference! In one frame rolling=rotation+translation, in other rolling is pure rotation. Look at the picture:

. --Infovarius (talk) 19:40, 7 October 2019 (UTC)[reply]

Talk:Q2643095

Autodescription — rolling (Q2643095)

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