Contact Properties

Use Materials	If checked, the properties are obtained from the materials database. If not checked, these values can be entered directly.
Material 1	Specifies the material for the first part to which the object is attached.
Material 2	Specifies the material for the second part to which the object is attached.
Impact	Select to use the impact method to determine the force when impact occurs. Also specify Stiffness, Exponent, Damping, and Penetration below.
Restitution	Enter two numbers that relate the incoming and outgoing velocities of the two contacting parts. We recommend that you only use the Restitution method in situations where there is not persistent contact between the bodies.
Use Coefficient of Restitution	Select to use the coefficient of restitution method to determine the force when impact occurs. If selected, the Coefficient of Restitution text box is enabled.
Coefficient of Restitution	Enter the coefficient of restitution for the impact. This box is only available if Use Coefficient of Restitution is selected.
Stiffness	Edits the stiffness of the boundary interaction between the two parts. It should be set to a number that approximates the material stiffness of the two parts in collision.
Exponent	Edits the exponent of the force deformation characteristic. The collision is modeled using an exponential force function.
Damping	Edits the maximum damping coefficient of the boundary interaction.
Penetration	Edits the boundary penetration distance where full damping occurs.
Friction Full	Select to use both static and dynamic friction values.
Friction Dynamic	Select to use friction in dynamic simulations.
Friction None	Select to not use any friction values. Friction effects are disabled.
Static Velocity	Specifies the velocity below which the static friction coefficient is in effect. Velocities between this velocity and the Dynamic Velocity transition between the static coefficient of friction and the dynamic coefficient of friction.
Dynamic Velocity	Specifies the velocity above which the dynamic friction coefficient is in affect. Velocities between this velocity and the Static Velocity transition between the static coefficient of friction and the dynamic coefficient of friction.
Static	Enter the static coefficient of friction. When the relative velocity of the two parts are at or below the Static Velocity, this is the fiction coefficient that is used. When the velocity is between the static velocity and the dynamic velocity, the friction coefficient transitions between this coefficient and the dynamic coefficient. The value must be between 0 and 1.
Slider next to Static	Adjusts the static coefficient of friction between 0 and 1.
Dynamic	Enter the dynamic coefficient of friction. When the relative velocity of the two parts are at or above the Dynamic Velocity, this is the friction coefficient that is used. When the velocity is between the static velocity and the dynamic velocity, the friction coefficient transitions between this coefficient and the static coefficient. The value must be between 0 and 1.
Slider next to Dynamic Mu	Adjusts the dynamic coefficient of friction between 0 and 1.

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