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设想bus和benz是离子,不去考虑他们本省的惯性。since the velocity V'(A) and V'(B) of the particles after impact are unknown in the direction as well as in magnitude, their determination will require the use for four independent equation先画个坐标:T-n
1, the component alone the t-axis of the moment of each particle, considered separately, is conserved; hence the t component of the velocity of each particle remain un-changed. so,
(V(A))t=(V'(A))t
(V(B))t=(V'(B))t
2, the component alone the n axis of the total momentum of the two particle is conserved:
m(A)V(A)n+m(B)V(B)n=m(A)V'(A)n+m(B)V'(B)n
3, the component alone the n-axis of relative velocity of the two particle after impact is obtained by multiplying the n-component of their relative velocity before impact by the coefficient of restitution:
(V'(B))n-(V'(A))n=e(V(A))n-(V(B))n) |
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