Autodesk Inventor's Dynamic Simulation module is a powerful tool. It can be used to demonstrate the functionality of your assemblies. You can apply gravity, forces, and torques to simulate a real world application of your product, and it's not hard to learn. That is, it's not hard to learn if you watch the Dynamic Simulation Made Simple course. This course shows the steps you need to create functional simulations of your assemblies. You'll learn tricks for setting up your assemblies before creating simulations, and you'll practice using all the commands.