KuNzululwazi nomNgcikisho, ubunzima noma isisindo sento yisiphoqi esisebenza entweni ngenxa yamandla womnyondo . [1] [2] [3]
- ↑ Richard C. Morrison (1999). Weight and gravity - the need for consistent definitions.
- ↑ Igal Galili (2001). Weight versus gravitational force: historical and educational perspectives.
- ↑ . p. 45–48.