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103年 - 103 淡江大學 轉學考 理論力學#53325
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(c) [10%] Using Lagrangian dynamics to show that the motion of the system can be reduced to an equivalent one-body problem.
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(b) [10%] The time differential of the linear momentum of the system is equal to the sum of all the external forces, as long as the internal forces follow 广-fp, where fy is the force acted on particle i by particle j.
#195395
(c) [5%] The total linear momentum for a system free of external forces is constant and equal to the linear momentum of the center of mass.
#195396
5. Two particles of mass m and m2 move in a plane and interact with each other by a central forces with the potential energy U{r)=M2 k r2，where A: is a constant, r叫ri-r2|, ri and 1*2 are position vectors of the two particles. (a) [5%] Write down the Lagrangian of the system.
#195397
(b) [10%] Show that the center of mass of the system moves in a constant velocity.
#195398
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#195405
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