Version: 2018.2 (switch to 2018.3b or 2017.4)
Composite Collider 2D
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Physics Material 2D

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A Physics Material 2D is used to adjust the friction and bounce that occurs between 2D physics objects when they collide. You can create a Physics Material 2D from the Assets menu (Assets > Create > Physics Material 2D ).

Properties

Property: Function:
Friction Coefficient of friction for this colliderAn invisible shape that is used to handle physical collisions for an object. A collider doesn’t need to be exactly the same shape as the object’s mesh - a rough approximation is often more efficient and indistinguishable in gameplay. More info
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.
Bounciness The degree to which collisionsA collision occurs when the physics engine detects that the colliders of two GameObjects make contact or overlap, when at least one has a rigidbody component and is in motion. More info
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rebound from the surface. A value of 0 indicates no bounce while a value of 1 indicates a perfect bounce with no loss of energy.

Details

To use a Physics Material 2D, simply drag it onto an object with a 2D collider attached or drag it to the collider componentA functional part of a GameObject. A GameObject can contain any number of components. Unity has many built-in components, and you can create your own by writing scripts that inherit from MonoBehaviour. More info
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in the inspectorA Unity window that displays information about the currently selected GameObject, Asset or Project Settings, alowing you to inspect and edit the values. More info
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. Note that for 3D physics, the equivalent assetAny media or data that can be used in your game or project. An asset may come from a file created outside of Unity, such as a 3D model, an audio file or an image. You can also create some asset types in Unity, such as an Animator Controller, an Audio Mixer or a Render Texture. More info
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is referred to as a Physic Material (ie, no S at the end of physic) - it is important in scripting not to get the two spellings confused.

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Composite Collider 2D
2D Joints