Hi, can someone please tell me how to calculate force which is acting on one atom. Lets look at the crystal of manganese for example, manganese crystal is simple cube (as far I remember) so how can I calculate force acting on one of 8 atom in that crystal? And one more question, it's often said that temperature is average kinetic energy of some object. So if It's known to me that some object have temperature of 300K and I know the mass of that object is it possible from this data to calculate kinetic energy of this object? English isn't my native language so it might be that I'm bit unclear to you, so just warn me and I would try to be more clear.