Newton's Law of Gravitation Calculator implementation

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

t4-071

Effect

Computation or source lookup only

Input and validation requirements

The specification omits input units, allowing a plausible centimetre-versus-metre interpretation that changes the result by a factor of 10000. The calculator must also reject r = 0 rather than return a numeric result. No actual formula branch exists to switch.

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": {
    "m1": 5,
    "m2": 10,
    "r": 2,
    "mass_unit": "kg",
    "distance_unit": "m"
  },
  "expected_outputs": {
    "F_N": 8.342875e-10
  },
  "working": "F=Gm1m2/r²=(6.67430×10^-11)(5)(10)/(2²)=(6.67430×10^-11)(50)/4=(6.67430×10^-11)(12.5)=8.342875×10^-10 N."
}

Other records

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