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牛顿运动定律揭示了物体运动状态发生变化的原因和规律。第一定律说明了物体在不受外力作用(或合外力为零)时,物体将保持原来的运动状态。它的重要意义在于指出了惯性是所有物体的基本属性,并给出了力和惯性的涵义。第二定律说明了物体所受到的合外力不为零时,物体运动状态要发生变化,产生加速度。这个加速度的大小跟物体所受的合外力成正比,跟物体质量成反比,它的方向与合外力方向
Newton’s law of motion reveals the causes and laws of changes in the motion state of objects. The first law states that the object will remain in its original state of motion when it is not subjected to an external force (or the external force is zero). Its significance is to point out that inertia is the basic attribute of all objects and gives the meaning of force and inertia. The second law states that when an external force applied to an object is not zero, the motion of the object changes and an acceleration occurs. The magnitude of this acceleration is proportional to the external force applied to the object, inversely proportional to the mass of the object, its direction and direction of the external force.