Recent content by PJani

Actually is the system centre. The system com is not "known" till the end of calculation/iteration How do you mean by orthogonal. Because everything is axis aligned...

offset is position of object from center of system(not the com_{system}) the com_i is "local" center of mass.

Hey i am working on something and i need to know how to calculate moment of inertia of a 3D system of objects. I know these variables: Mass of whole system Center of mass of whole system Center of mass of each object Offset of each object Mass of each object Moment of Inertia of each...

I can use \tau = r \times F for point contacts with ground and then calculate produced torque. Which gives me no problem. But what if i spin box around ground normal. how can i get then torque which will stop the box from spining on ground?

Yes i know, that why i can't get it because box spins on ground and it has full contact on ground whole area is in contact. That why i can't figure out what i could do with r. because r is scalar and not contact area!

Yes i know for that relation but what if i have box on the ground which fully touches ground with all bottom area. Which i spin and i know that static friction is k_s and kinetic is k_k. How can i figure out when box will stop rotating? Box has some moment of inertia and some mass... I...

I am trying to figure out how exactly Angular friction ("torque") is connected with friction force. Is there any connection between torque friction and force friction?