Recent content by dws

wow, thanks a lot for the answers. I somehow can understand the concept behind it, I will ponder and 'munch' on the actual equation at my own pace. The concept itself is much more important. I have been consulting with my friends in this field as well. It seems for many years I have slightly...

Hi sorry for not being clear. I'm now concerned about the kinetic friction between object and the ground not the drag friction caused by the air. Because when the object spins, it 'slides' on the ground, therefore it should have kinetic friction as well. But I'm not sure how can I draw this...

I've been wondering for some time and it seems I still have doubt on how friction works on spinning object. Assume a situation like this (top down view): http://img33.imageshack.us/img33/5889/physics.jpg Assume dimension of the box is w and h, ignore the thickness of the box for time...