为什么小球速度最大时合力为0呢

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select * from tbl_Articles WHERE ArticleID=1832496 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1832496 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1832496 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(553724,302946,1083000,272560,506786,1062538,1102032,326348,2951980,2131827,1090286,1102672,1128475,1464414,666691,301003,522637,185989,589161,1275345,1073858,1132737,173700,2437972,1123883,1304908,3178684,1126606,496746,1128021) ORDER BY field (ArticleID,553724,302946,1083000,272560,506786,1062538,1102032,326348,2951980,2131827,1090286,1102672,1128475,1464414,666691,301003,522637,185989,589161,1275345,1073858,1132737,173700,2437972,1123883,1304908,3178684,1126606,496746,1128021)