水中球体在外力作用下运动做功的研究  

The study on doing work of sphere motion under external force

作　　者：石业娇[1] 

机构地区：[1]大连海洋大学应用技术学院,辽宁大连116300

出　　处：《辽宁师专学报（自然科学版）》2015年第2期13-16,共4页Journal of Liaoning Normal College(Natural Science Edition)

摘　　要：根据均匀质球体的密度与水的密度之间的大小关系,研究了外力作用在均匀质球体上使其在水中做上下垂直运动情况下的做功问题.首先确定了球体在水中的平衡位置,得到了当球体的密度小于水的密度时球体的平衡位置方程;在确定了不同密度的球体在水中平衡位置的基础上,研究了将沉入水下部分的球体提出水面的做功问题;对于将位于水面以上的球体部分压入水中做功问题的处理,则是先求得了浮力函数,然后再利用此浮力函数完成压球入水做功的计算.Based on the relationship of the density between uniform sphere and water,the study on doing work of uniform sphere is carried out while it is worked perpendicularly in water under the influence of external force.First identify the equilibrium position of the sphere in order to get the equation concerned on condition that the sphere＇s density is smaller than that of the water.On the basis of the recognition of the equilibrium position about different spheres with density in the water,the problem of doing work is studied when the sphere sinking into the water leaves the water.On the other hand,with regard to the calculation of doing work of the sphere on the surface pressed into the water,buoyancy function is obtained and with it doing work accordingly is calculated.

关 键 词：浮力定律 做功 密度 球体 

分 类 号：O313[理学—一般力学与力学基础]