# interaction toy.drag

Describes the entry `toy.drag` at version `0.2.0`, registered by `mime.testing.toys._entries.ToyDrag`.

## At a glance

- interaction `toy.drag`, version `0.2.0`, namespace `toy`
- Family: [`toy`](../../families/toy.md), with 2 built rungs among its members; compared on its page
- Rungs built: [`linear`](#rung-linear), [`quadratic`](#rung-quadratic)
- Nodes: [`ToyDragNode`](../../nodes/ToyDragNode.md)
- Undocumented, so with no equations to link: [`ToyDragNode`](../../nodes/ToyDragNode.md)
- Derivative: `exact`
- Validity: none declared

## What it models, and when not to use it

No hand-written part: this entry's source has not been written (the docs walk counts it).

## Settings

| Setting | Type | Default | Dimension | Role | Default's kind |
|---|---|---|---|---|---|
| `c` | `Annotated[Quantity, Mass / Time]` | `{"unit": "kg s^-1", "value": 0.37}` | kg s^-1 | none declared | none: required |
| `rung` | `str \| None` | `null` | none | none declared | none: required |

Each role and default's kind is the entry's `setting_roles` (`mime.registry.SettingRole`); a setting that declares none is required.

## Roles, reads and deliveries

Roles, bound by keyword when the entry is attached: `body` (body).

Reads:

| Label | Reads |
|---|---|
| `v` | body [`toy.body.velocity`](../../vocabulary.md#namespace-toy) |

Delivers:

| Label | Role | Into the target |
|---|---|---|
| `load` | body | [`toy.body.load`](../../mechanisms/load.md) |

## Rungs

A rung is a section of this page, and the entry's `rung` setting names it; there is no default.

### Rung linear

- [`ToyDragNode`](../../nodes/ToyDragNode.md)

declared, unchecked: no round-trip case builds this rung, so the node walk does not compare the declaration with a build.

Supported constructions, by what each bound thing's dynamics or field provider must offer:

| Requires | Note |
|---|---|
| body: accepts [`toy.body.load`](../../mechanisms/load.md) |  |

### Rung quadratic

- [`ToyDragNode`](../../nodes/ToyDragNode.md)

Declared in `builds`; the node walk compares it with what a round-trip case builds.

Supported constructions, by what each bound thing's dynamics or field provider must offer:

| Requires | Note |
|---|---|
| body: flag inertial, accepts [`toy.body.load`](../../mechanisms/load.md) |  |

## Gradient status

The derivative through this entry is `exact`, the derivative of what it computes.

## Validity

none declared

## Family

Declared: [`toy`](../../families/toy.md). The family's conformance suite is run by a test of the lab or of MIME; which test, and in which lane, is resolved when the evidence resolver lands.

## References

none declared

## Other declarations

| Class variable | Type | Value |
|---|---|---|
| `holds_off` | `ClassVar[str \| None]` | `null` |
| `id_roles` | `ClassVar[tuple[str, ...] \| None]` | `null` |
| `moving` | `ClassVar[bool]` | `false` |