动量定理是高考的重点,它既适用于恒力作用问题也适用于变力作用问题,既适用于直线运动问题也适用于曲线运动问题,因此在高中物理的各个单元都有广泛应用。其表达式为I=ΔP,该式为矢量式,其中I是合外力的冲量,也可以是各冲量的矢量和;ΔP是物体动 Momentum theorem is the key point of college entrance examination. It applies not only to constant force problem but also to variable force action problem. It is not only suitable for linear motion problem but also for curvilinear motion problem. Therefore, each unit of high school physics is widely used. Its expression is I = ΔP, the formula is vector type, where I is the impulse of external force, it can be a vector sum of the impulse; ΔP is the object moving