Interactions are objects that you create to model mechanical
relationships between surfaces that are in contact or closely spaced.
Mere physical proximity of two surfaces on an assembly is not
enough to indicate any type of interaction between the surfaces. A contact
interaction is required. The general contact approach is used in this example.
A contact interaction requires a reference to an interaction property.
Interaction properties are collections of information that help you to define
certain types of interactions. You will create a mechanical interaction
property that describes the tangential and normal behavior between all surfaces
as frictionless. You will name this property
NoFric.