A Traditional Motion-Law. This is a Polynomial motion-law.

The Velocity increases or decreases linearly.

Acceleration is constant, but it is discontinuous at its start and end.

Jerk is generally zero, but has infinite Jerk at its start and end.

Start Position

The Start-Position usually flows from the End-Position of the Previous-Segment.

End Position

Start Velocity

End Velocity

Start Acceleration and End Acceleration

Start Jerk and End Jerk

None

None

Segments with Constant Acceleration, Linearly Increasing-Velocity, or Linearly Decreasing Velocity.

You can use this to model a Part under the influence of a Constant-Acceleration, or a constant force or torque.