Mechanism Design and Mechanism Dynamics > Mechanism Design > Creating Mechanism Models > Motion Axis Settings > About Dynamic Properties
  
About Dynamic Properties
Click the Dynamic properties button on the Motion Axis dialog box to access the Coefficient of restitution and Enable friction settings.
• Coefficient of restitution—Simulates impact forces when the motion axis reaches its limits.
• Enable friction—Simulates friction, a force that restricts motion of the axis' surfaces against each other. The force acts in the direction opposite to the direction of the axis' motion. A coefficient of friction, static or kinetic, controls the magnitude of the force. Both coefficients depend on the type of material in contact. You can find charts with the coefficients for typical surface combinations in physics and engineering texts.
◦ (Static Coefficient of Friction)—Specifies the friction force that prevents the surfaces of the axis from moving against each other until a limit at which motion begins. The static coefficient of friction is larger than or equal to the kinetic coefficient of friction.
◦ (Kinetic Coefficient of Friction)—Specifies the friction force that prevents the axis surfaces from moving freely against each other slowing down the motion.
◦ (Contact Radius for a rotation axis only)—Specifies the value for the distance between the motion axis and the point of contact. The value should be greater than zero. This value defines the radius of a circular area on which the friction torque acts.