论文部分内容阅读
动量定理的内容是物体所受合外力的冲量等于物体动量的变化,即 I=△p.动量定理表明冲量是物体动量发生变化的原因,冲量是物体动量变化的量度.这里所说的冲量必须是物体所受的合外力的冲量,动量定理可以用牛顿第二定律导出,但适用范围比牛顿第二定律要广,在不涉及加速度和位移的情况下,研究运动和力的关系时,用动量定理求解一般较为方便,而且能得到迅速解答,达到事半功倍的效果.一、用动量定理求变力的冲量问题
The content of the momentum theorem is that the impulse of the external force exerted by the object is equal to the change of the object’s momentum, that is, I = △ p. The momentum theorem shows that the impulse is the reason why the object’s momentum changes. The impulse is the measure of the object’s momentum. Is the impulse of the external force exerted by the object. The theorem of momentum can be derived from Newton’s second law, but its scope of application is broader than Newton’s second law. When studying the relationship between motion and force without involving acceleration and displacement Momentum theorem is generally more convenient to solve, and can be quickly answered, to achieve a multiplier effect.