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Bouncing Bob Pendulum

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mass ratio
0.58
length ratio
0.9
rebound ratio
0.85
initial position bob 1
60°
initial position bob 2
40°
show trace bob 2
type of plot
position
speed
energy
animation
E
k
U
E
t
This Demonstration simulates the motion of a double pendulum with the upper bob bouncing back from an obstruction along the vertical axis.
Mathematica's built-in function WhenEvent, triggered whenever the upper bob crosses the vertical, reverses and reduces the angular speed of the upper pendulum and changes the behavior of the lower pendulum accordingly.
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