What does massless actually do?

Hi all I am using a rope attachment to drag a block around, it is connected to the humanoidrootpart and the bricks hitbox. If i set either the bodydepthscale or bodywidthscale to around 0.1-0.2 the brick will not move with the player. I tried setting the brick to massless but it doesn’t do anything, the only thing that works is setting the density of the brick with customphysicalproperties, but why would the density change anything if the brick is meant to be massless.

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It applies to welded parts.

If this property is enabled, the part will not contribute to the total mass or inertia of its rigid body as long as it is welded to another part that has mass.

For example, if you were you were to have a part welded on to that brick, you could use massless to make the weight of that welded part make no difference.

So because that brick is just attached to the HumanoidRootPart and not welded to anything, the massless property makes no difference, however the custom physical properties will, hence why density makes a difference.

https://developer.roblox.com/en-us/api-reference/property/BasePart/Massless

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