# Up and down, light and heavy, fast and slow—but where?

> Research article (Physics Education, 2019) · cited 10× · AI/ML

**Wikidata**: [openalex:W2911764967](https://www.wikidata.org/wiki/openalex:W2911764967)  
**Source**: https://4ort.xyz/entity/up-and-down-light-and-heavy-fast-and-slowbut-where