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工作学习 / 学科技术 / 牛顿力学第二定律是如何表达的？中文，英文皆可。你在学校学习牛顿定律的时候，老师如何教你的？谢谢。
-111111(快乐老家);
2018-10-21
(#11756061@0)
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In an inertial reference frame,the vector sum of the forces F on an object is equal to the mass m of that object multiplied by the acceleration a of the object: F = ma. (It is assumed here that the mass m is constant – see below.)
https://en.wikipedia.org/wiki/Newton's_laws_of_motion
-sailor(Ocean & Mountain);
2018-10-21
{255}
(#11756093@0)
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The second law states that the rate of change of momentum of a body is directly proportional to the force applied, and this change in momentum takes place in the direction of the applied force.What is difference between them? Which one is original definition ? Why are there two different definitions OR statements ? Thank you.
-111111(快乐老家);
2018-10-21
{134}
(#11756170@0)
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What you said is an implication of F=ma.
-sailor(Ocean & Mountain);
2018-10-21
(#11756176@0)
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You are right. However, the Momentum is the Key.
-111111(快乐老家);
2018-10-21
(#11756255@0)