一、动量定理的应用技巧1.应用I=ΔP求变力的冲量如果物体受到变力作用,则不能直接用I=Ft求变力的冲量,这时可以求出该力作用下物体动量的变化ΔP,等效代换变力的冲量I.例1物体A、B用轻绳相连挂在轻弹簧下静止不动,如图1所示.A的质量为m,B的质量为M.当连接A、B的轻绳断开后,物 First, the application of the momentum theorem skills 1. Apply I = ΔP impulse to change the force if the object is subjected to variable force, you can not directly use I = Ft impulse to change the force, then you can find the force under the action of the object momentum Change ΔP, equivalent displacement of the impulse of the variable force I. Example 1 The objects A, B are linked with a light rope and hung under the light spring, as shown in Fig. 1. The mass of A is m, and the mass of B is M. When the light rope connecting A, B is disconnected,