Which one is NOT TRUE about a planar motion of a rigid body
     Which one is NOT TRUE about a planar motion of a rigid body?  All the particles of a rigid body in planar motion moves along paths which are equidistant from a fixed plane.  The spinning motion of a wheel of a moving truck is a planar motion.  The translation and rotation about a fixed axis are two special cases of planar motion.  If a rigid body moves around a circular path, it cannot be in translational motion. 
  
  Solution
The spinning motion of a wheel of a moving truck is a planar motion is NOT TRUE about planar motion of a rigid body.

