See the physics example in the exampleScripts folder. For more on physics see the Vizard Documentation
To see how to toss objects with more velocity, see the example "Tossing_Objects"
Add this line of code towards the top of your script (for multi-user on both the server and client):
viz.phys.enable()
Access the gaze objects manually and apply physics using this code in your experiment function. For Multi-User you need to add this code to both the experiment function on the client and the "recordWithTimer" function for the server.
environmentModel = objects[0]
environmentModel.collideMesh()
environmentModel.hint(viz.OPTIMIZE_INTERSECT_HINT)
basketball = gazeObjectsDict['Basketball']
basketball.collideSphere()
#You can also just add a collidePlane to the env to create a floor plane
env = vizfx.addChild("utils/resources/environment/dojo.osgb")
env.collidePlane()