I've seen a lot of games where as your character lands on a platform, gravity kicks in and then it falls. I messed with the linear velocities, preset and object type but couldn't achieve this. I'm also curious about how to make platforms move only a certain distance left, right, up or down and then stopping in place.
To have them fall, set the object type to physics, then add a wake up component set the wake up attribute to collision.
For that you need to place a Logic Transform object. Set affected object, all other objects will be unaffected so if you need 3 different platforms to stop then you may need to add 3 Logic Transforms... Set maths to Replace and Velocity to 0 and the precise position where you want your platform landed (or just leave it empty). Fields you leave empty will be not affected by that logic.