Roblox Properties GUI keyword

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Documentation
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Engine
Reference
Data Types
PhysicalProperties
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The PhysicalProperties data type describes several physical properties of a BasePart: Density, Elasticity, and Friction. It is used in the similarly-named BasePart.CustomPhysicalProperties property.

Weighting Behavior
PhysicalProperties also provides weightings properties, ElasticityWeight and FrictionWeight. When two parts interact, the friction and elasticity between them are determined in the same way by the following pairwise weighted average function:

local function getActualFriction(partA, partB)
	return (partA.Friction * partA.FrictionWeight + partB.Friction * partB.FrictionWeight) / (partA.FrictionWeight + partB.FrictionWeight)
end
Although the formula above refers to the Friction and FrictionWeight of two parts, A and B, the formula is used in the same manner when determining Elasticity. Generally, when the weight of A is much greater than that of B, the actual value will be closer to A. If the weights are similar, the actual value will be close to the midpoint between their individual values.

Summary
Constructors
new(material : Enum.Material)
Returns a PhysicalProperties with the default properties for the given material.

new(density : number,friction : number,elasticity : number)
Returns a PhysicalProperties with the specified density, friction, and elasticity.

new(density : number,friction : number,elasticity : number,frictionWeight : number,elasticityWeight : number)
Creates a PhysicalProperties container with the specified density, friction, elasticity, weight of friction, and weight of elasticity.

Properties
Density:number
The mass per unit volume of the part.

Friction:number
The deceleration of the part when rubbing against another part.

Elasticity:number
The amount of energy retained when colliding with another part.

FrictionWeight:number
The importance of the part's Friction property when calculating the friction with the colliding part.

ElasticityWeight:number
The importance of the part's Elasticity property when calculating the elasticity with the colliding part.
ListLayout
GridLayout
PageLayout
UICorner
UIGradient
UIStroke
UISizeConstraint
UITextSizeConstraint
UIAnchor
TextButton
TextLabel
ImageLabel
ImageButton
Frame
ScrollingFrame
TextBox
SurfaceGui
BillboardGui
AlignPosition
AlignOrientation
AlignSize
ScreenGui
Frame
TextLabel
TextButton
ImageLabel
ImageButton
UICorner
UIPadding
UIScale
UIStroke
UIGridLayout
UIListLayout
UIPageLayout
UIPadding
UIAspectRatioConstraint
TextBox
ScrollingFrame