Talk:Q11376
Autodescription — acceleration (Q11376)
- Useful links:
- View it! – Images depicting the item on Commons
- Report on constraint conformation of “acceleration” claims and statements. Constraints report for items data
- Parent classes (classes of items which contain this one item)
- Subclasses (classes which contain special kinds of items of this class)
- ⟨
acceleration⟩ on wikidata tree visualisation (external tool)(depth=1) - Generic queries for classes
Union and disjoint queries
- Instances of acceleration (Q11376)
that are instances of two (or more) of the classes: [1] - Instances of acceleration (Q11376) that are instances of none of the classes tangential acceleration (Q2673034) and centripetal acceleration (Q2248131) [2]
- See also
- This documentation is generated using
{{Item documentation}}.
Physical quantity: Subclass or instance?
[edit]@Infovarius: An expression like "5 m/s^2" refers to an "individual quantity". The former is an instance, the latter a class. "Individual quantity" has subclasses like "physical quantity", which has further subclasses like "acceleration", "length" and so on. The latter ones can be further subdiveded. For instance, "length" has subclasses "radius", "wavelength", "diameter" and so on. This is well explained for instance in Defining 'kind of quantity' (Q71548419), especially see figure 2 on page 5: Elements inside a box are in the same meta-class and therefore connected with "subclass of". Toni 001 (talk) 20:14, 20 October 2019 (UTC)
- @Infovarius: I left a question about the general issue on project chat: Wikidata:Project chat#Quantities: Instances and Classes Toni 001 (talk) 11:30, 22 October 2019 (UTC)
@Toni 001: I see that in the formula you have replaced time (Q11471) with duration (Q2199864), implying that the former is the dimension, not the quantity. In my opinion, the descriptions on time (Q11471) are somewhat misleading. I would say that time (Q11471) is the physical quantity that we are talking about, i.e. specification of a point in time. On the other hand, duration (Q2199864) is the difference between two such points, which is not what we want. — Petr Matas 07:45, 20 July 2023 (UTC)
- The distinction was discussed here. As as result, duration (Q2199864) refers to the quantity, measured in seconds. Note also the attached references and external identifiers. Toni 001 (talk) 07:29, 21 July 2023 (UTC)
- @Petr Matas: in definition of acceleration we use difference, not a moment of time. --Infovarius (talk) 15:44, 28 July 2023 (UTC)