Interface Force calculation for CREO Simulate

Hi All,

 I have doubt for Interface Force calculation at Contact Area in Creo Simulate.

1. What is the Unit of  Interface Force & Interface Area (for mmNs) ?

2.  Larger the Contact Area, Smaller the force.

3. If I divided the contact area into specific contact area zone (Using Volume region), Interface force is increasing, why ?

4. What is difference between Component force & Surface to Surface force ?

Can anyone help me to understand above point. After solving one CREO Simulation it look Like got very high interface force practically which is impossible.