This article has studied the definite integral used in the physics application from power,force,moment of inertia,orthocenter of plane figure and calculation of inertia moment,mainly utilizing the research method from particulars to generals.

• 本文从功、力、转动惯量、平面图形的形心和惯性矩的计算这几个方面研究了定积分在物理学中的应用，主要运用了从特殊推广到一般的研究方法。