To control when an object falls you could either keyframe the “Enabled” setting in the dynamics tag, or keyframe the “Dynamic” setting from Off to On. The advantage of the second option is that leaving “Enabled” checked on, and keyframing “Dynamic” from Off to On, will allow the object to react to collisions, and obey timeline commands (position animation, for example), then begin falling at the point in time where you keyframe it to “On.” When you change the “Dynamic” setting from On to Off you will see the tag’s icon change from that of a Rigid Body to that of a Collider Body, indicating the change in properties. With the “Enabled” setting unchecked it’s as if there is no dynamics tag on the object. Other options for controlling when dynamics takes effect and takes control of a tagged object can be found in the “Trigger” setting.
