社会 返回
天气预报 > 社会 > 怎么判断重力势能做正功还是负功
怎么判断重力势能做正功还是负功
更新时间： 2021-02-23 07:43:33  

1、判断力对物体做正功还是负功,只需要把力和位移矢量的起点都画在物体的重心上,看力和位移矢量的夹角.如是锐角,正功；钝角,负功；直角,不做功.

2、总功,需要求各功的代数和.

3、各功对应不同的能量变化,例如：重力做正功,重力势能减少；重力做负功,重力势能增加.合力做正功,动能增加；合力做负功,动能减少.

关键词： 怎么 判断 重力 势能 还是

怎么判断重力势能做正功还是负功相关经验

天气预报

最新推荐

页面:/news/view-947100/ | 耗时:0.5658 s | 内存:2.11 MB | 查询:4 | 缓存读取:3 写入:0 | 加载文件:25
select * from tbl_Articles WHERE ArticleID=947100 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=947100 LIMIT 0,1
select * from tbl_Articles_sphinx where id=947100 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1046786,676837,629446,575399,1380956,918458,1785039,1357639,1152266,394134,387256,81337,1858412,1139186,1061550,1171335,1097165,1480486,536083,474682,817229,414228,1062652,778768,711335,1915807,946170,1059056,1841909,1070200) ORDER BY field (ArticleID,1046786,676837,629446,575399,1380956,918458,1785039,1357639,1152266,394134,387256,81337,1858412,1139186,1061550,1171335,1097165,1480486,536083,474682,817229,414228,1062652,778768,711335,1915807,946170,1059056,1841909,1070200)