Dear Mr. Hwang,

thank you very much for the answer. The player impression of the ball having more spin later after the bounce makes a lot of sense now.

Could you explain this sentence?
[quote]The bottom of the ball tends to moving forward relative to table when the ping-pong ball touch the table.[/quote]

Would the introduction of the vertical force G complicate the model too much? If not, could you extend your explanation and the simulation with this force?

The same questions as above for introducing sliding at bounce in the model?

Best regards,

Carlos

PS: I can not see the formulas on my browser (I can see the formating flags on the editor, however). What software/version do I need to see them?