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Hi All,

I am new here and this is not a homework question... I'm turning 40 this year and my retention of physics is low to say the least. I am trying to rekindle some knowledge... Just for fun!

I am trying to use a spreadsheet to model the motion of a system of two particles under gravitational-type forces where one particle has a fixed position and the other is given an initial position and velocity vector. Both particles also have a known mass, e.g.,

P1(m1,x1,y1) [fixed position]

P2(m2,x2,y2,v2)

The way I'm approaching this, P2 should move predictably in a time-slicedt. P2 is influenced by its momentum as well as the "gravitational" attraction to P1.

I can figure the "gravitational" force vector with no problem.

The thing I am hung up on is how to figure the contribution of P2's momentum. I'm not even sure I'm using the correct term here. Once I know how to calculate this vector correctly, I think I can do the math.

Please let me know if anything is unclear.

Thanks!

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# Modelling Gravitational Motion

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