Problem 323. Mechanics 1
I thought I would make a mechanics problem for all those physics lovers out there.
Imagine two solid, rigid spheres B1 and B2 with radius R1 and R2 and mass M1 and M2. B1 initially has its center of mass at the origin and is confined to always move along the x axis. B2 has its center of mass located at coordinates (x2,y2) where 0<x2<(R1+R2) and sqrt((R1+R2)^2-x2^2)<y2. Gravity acts in the negative y direction with constant g = 9.8 in some consistent unit system.
Write a function that returns the velocity of both spheres after B2 is allowed to fall, assuming a lossless collision occurs. Keep in mind that the answers should be two-element row vectors. For example, if R1=1, R2=.25, M1=2, M2=4, x2=.5 and y2=6, then:
[V1,V2] = balldrop_puzz(M1,M2,R1,R2,x2,y2)
V1 = [-10.8362631979321 0] V2 = [5.41813159896603 2.66024980473149]
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6 Comments
if you didn't already have a master's in mechanical engineering, i'd be concerned this was your homework problem.
LOL, bmtran! Just trying to have a little fun with the format. Indeed, it has been so long since I solved this kind of problem that I can only hope I didn't make a mistake that would show up in the test-suite!
I assuming that you're neglecting any rotation caused by grazing collisions.
@Tom, yes that is true. There is no friction.
The tip is coefficient of restitution (COR); and imagining that B1 is a pendulum may help.
after fall, is B2 hitting B1 directly?
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