Everything is as light as a feather

Development World Creation
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All default settings. 100kg vs 1000kg:

Additional physical interactions relating to player characters specifically are here:

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And nitty-gritty nuances of Chaos are here:

https://dev.epicgames.com/documentation/en-us/unreal-engine/physics-settings-in-the-unreal-engine-project-settings?application_version=5.0

And you also have access to Physical Materials:

There is also, ofc, the entire Geometry Collection - but you did not specify whether you’re using it to chop trees.