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I need to make a moving model of my robot and for that i need force motors, dynamic motion, gravity, friction, etc. So any help would be but welcome.
If I remember correctly trail version of Creo contains modules for part/assembly/drawing/sheetmetal design and basic mechanism design. Things you're writing about (gravity, force motors) belong to additional advanced module Mechanism Dynamic Option (which is sold as separate license) and are simply not available in trial version of Creo.