On conservative conditions in conservative law of mechanical energy
HE Kai-ji · 2005
Several viewpoints concerned conditions of the conservation law of mechanical in college physics were discussed.In view of energy variation of particle system caused by external force works and non-conservatio force works which is an internal force,the conservation conditions of mechanical energy in particle system were analyzed and P_(ext)=0,P_(int,n-cons)=0 in particle system were proposed as conservation conditions of mechanical energy.