Returns a `Datatype.PhysicalProperties` container, with the density, friction, and elasticity specified for this material.

PhysicalProperties.new

material

Returns a `Datatype.PhysicalProperties` with the default properties for the given material.

Returns a `Datatype.PhysicalProperties` container, with the specified density,
friction, and elasticity.

density

friction

elasticity

Returns a `Datatype.PhysicalProperties` with the specified density, friction, and
elasticity.

Creates a `Datatype.PhysicalProperties` container with the specified density,
friction, elasticity, weight of friction, and weight of elasticity.

frictionWeight

elasticityWeight

Creates a `Datatype.PhysicalProperties` container with the specified density,
friction, elasticity, weight of friction, weight of elasticity, and acoustic absorption.

acousticAbsorption

The `Datatype.PhysicalProperties` data type describes several physical
properties of a `Class.BasePart`:
`Datatype.PhysicalProperties.Density|Density`,
`Datatype.PhysicalProperties.Elasticity|Elasticity`, and
`Datatype.PhysicalProperties.Friction|Friction`. It is used in the
similarly-named `Class.BasePart.CustomPhysicalProperties` property.

#### Weighting Behavior

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

```lua
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
`Datatype.PhysicalProperties.Friction|Friction` and
`Datatype.PhysicalProperties.FrictionWeight|FrictionWeight` of two parts,
**A** and **B**, the formula is used in the same manner when determining
`Datatype.PhysicalProperties.Elasticity|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.


PhysicalProperties

A value between `0` and `1` denoting how absorbent the material is to
`Class.AudioEmitter|AudioEmitters`. When using acoustic simulation,
surfaces with higher absorption will result in less reverb than surfaces
with lower absorption.

Note that this does not affect the degree to which audio transmits
**through** surfaces; for that, see
`Datatype.PhysicalProperties.Density|Density`.


PhysicalProperties.AcousticAbsorption

A value between `0` and `1` denoting how absorbent the material is to
`Class.AudioEmitter|AudioEmitters`.


Density is defined as the amount of mass per unit volume. The more dense a
part is, the more force it takes to accelerate it. Acceptable range is
`0.0001` to `100.0` and values outside this range will be clamped.

When using acoustic simulation, parts with higher density will muffle
occluded `Class.AudioEmitter|AudioEmitters` more.


PhysicalProperties.Density

Friction is defined as the force that opposes the relative lateral motion
of two solid surfaces in contact. The greater the friction on a part, the
quicker it will decelerate when it rubs against another part with
friction. Acceptable range is `0.0` to `2.0` and values outside this range
will be clamped.


PhysicalProperties.Friction

The deceleration of the part when rubbing against another part.


Elasticity refers to a part's tendency to retain energy when colliding
with another part. An `Datatype.PhysicalProperties.Elasticity|Elasticity`
of 1 indicates that the part bounces with the same energy it had before a
collision. Acceptable range is `0.0` to `1.0` and values outside this
range will be clamped.


PhysicalProperties.Elasticity

The amount of energy retained when colliding with another part.


The friction weight of two parts rubbing together creates a ratio used to
calculate the actual friction between the two parts. The higher a part's
`Datatype.PhysicalProperties.FrictionWeight|FrictionWeight`, the more its
`Datatype.PhysicalProperties.Friction|Friction` is used. Acceptable range
is `0.0` to `100.0` and values outside this range will be clamped.


PhysicalProperties.FrictionWeight

The importance of the part's
`Datatype.PhysicalProperties.Friction|Friction` property when calculating
the friction with the colliding part.


The elasticity weight of two parts colliding creates a ratio used to
calculate the actual elasticity between the two parts. The higher a part's
`Datatype.PhysicalProperties.ElasticityWeight|ElasticityWeight`, the more
its `Datatype.PhysicalProperties.Elasticity|Elasticity` is used.
Acceptable range is `0.0` to `100.0` and values outside this range will be
clamped.


PhysicalProperties.ElasticityWeight

The importance of the part's
`Datatype.PhysicalProperties.Elasticity|Elasticity` property when
calculating the elasticity with the colliding part.


Describes properties that affect the physical behavior of a `Class.BasePart`.


/reference/engine/datatypes/PhysicalProperties.yaml

Enum

Enum.Material

An object that runs connected functions upon a specific occurrence.

Data Type

RBXScriptSignal

A double-precision floating-point number.

Luau

number

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This method is asynchronous and returns an `Operation`, which represents the current state of the operation. It contains an endpoint path that you can poll to obtain the real response and applicable metadata. See the [documentation]({longRunningOperationsLink}) on long-running operations for more information.
            
The following sections describe the response and metadata objects that are provided when an operation completes.

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information on generating proper keys, see [Manage API keys]({apiKeyReferenceDocLink}).

For more information on generating keys, see [Manage API keys]({apiKeyReferenceDocLink}).

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This string is formatted as a [FieldMask](/cloud/reference/types#fieldmask).

A JSON value can be `null`, `boolean`, `string`, `number`, `array`, or `object`.

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Resource Paths

This string is formatted as a [Timestamp](/cloud/reference/types#timestamp).

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Create, update, and manage your ad campaigns.

This allows viewing information about your assets.

This allows uploading and updating assets to Roblox.

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This allows you to view the status and results of avatar auto-setup jobs on your behalf.

This allows you to create and manage avatar auto-setup jobs on your behalf.

Grants the ability to update badges owned by the user.

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This allows viewing information about your commerce merchant connections.

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This allows you to view information about your Creator Store products.

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Grants permission to read community information.

Grants access to read and write your localization tables

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Grants access to manage your experiences and certain information associated with your experiences (e.g. localization information).

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Allows you to view the status, logs, and results of Luau execution tasks for the associated place.

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