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And what part did you have a problem with? You attack without being specific. What did I say that is wrong? People want to know!dude have you ever played at a competitive level with proper technique with soft and hard rubbers? Hard rubbers DO need more force, F=k*x does not explain everything especially in a dynamic not static phenomenon like lifting underspin. If you are trying to use physics on me, at least use it correctly. Im not gonna bother answering again cause anyone with physics and dynamics of ball movement understanding, and i dont mean the laws of physics, knows what im talking about.
I never said F=k*x explains everything but it is an important part of any simulation that has to do with contact between the ball and rubber.
Now why do hard rubbers need more force? More force to do what? Be specific. Anybody can make stuff up and make bogus claims.