ELI5- How exactly do mass and density differ in their contribution to an object’s ability to resist deformation?

Question

I know mass moreso helps specifically with how hard an object is to move around, but what about a massive object that is less dense than another but still has more mass overall, would it be harder to deform all else equal?

In: Physics

Answer 1

Mass and density are just heuristics that sometimes work for ability to resist deformation since a lot of low density stuff is filled with air.

But really they don’t directly have anything to do with it.

Butter is way denser than wood, depending on the wood by a factor of 10.