To run a motion study for a layout sketch:
- 
Create the layout sketch mechanism, editing Mass Properties in the Block PropertyManagers as necessary.
 
Mass properties are used only for motion calculations in  Motion Analysis studies. 
 
- 
Create a motion study for the layout sketch.
 
Constraints you apply in the layout sketch appear as mates in the motion study. You cannot edit these mates. 
 
- Add motion study elements, such as forces or motors, as necessary.You cannot add contact between layout sketch blocks. 
- Select either Motion Analysis or Animation and run the motion study.