Click or Edit > Gravity. The Gravity dialog box opens. A WCS icon and an arrow showing the direction of the gravitational acceleration also appear.
Edit the magnitude of the gravity acceleration vector.
Edit the directional coordinates for the vector.
Press ENTER. The direction of the arrow changes to match the current directional vector.
Note: To apply gravity to your mechanism during an analysis, you must select the Enable Gravity check box on the Ext Loads tab of the Analysis Definition dialog box.
About the Gravity Dialog box
To Enable Gravity