Source: https://guthlabs.ai/docs/instruments/hooke-s-law-spring-force-calculator/implementation/

instrument implementation / implementation-contract

# Hooke's Law Spring Force Calculator implementation

A source-bound implementation contract for Hooke's Law Spring Force Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t4-283

**Effect**: Computation or source lookup only

## Input and validation requirements

A finite extreme input, k = 1e308 and x = 1e308, produces -Infinity in plain JavaScript arithmetic instead of a finite force. The specification also leaves the sign convention for x ambiguous, which can reverse the reported force direction.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "k": 200,
    "k_unit": "N/m",
    "x": 0.015,
    "x_unit": "m"
  },
  "expected_outputs": {
    "F": -3,
    "F_unit": "N"
  },
  "working": "F = −kx\nF = −(200 N/m)(0.015 m)\nF = −3 N"
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/hooke-s-law-spring-force-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/hooke-s-law-spring-force-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/hooke-s-law-spring-force-calculator/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche4/tranche4-results.json`