KuNzululwazi nomNgcikisho, ubunzima noma isisindo sento yisiphoqi esisebenza entweni ngenxa yamandla womnyondo . [1] [2] [3]

  1. Richard C. Morrison (1999). Weight and gravity - the need for consistent definitions. 
  2. Igal Galili (2001). Weight versus gravitational force: historical and educational perspectives. 
  3. . p. 45–48. Missing or empty |title= (help)