Description
Compute planar phantom force-arm moment with an explicit opposing moment.
A bench or research calculation starts from supplied measurements, reference values, and unit conventions. A transformed value, timing difference, or support fraction describes that model; its clinical meaning depends on measurement validity and a separate professional assessment.
Compute planar phantom force-arm moment with an explicit opposing moment.
When to use this tool
Use it for joint phantom moment arm force term when the required inputs and conventions are already available.
How to use the tool and how it works
- Enter force, leverArm, angleRadians, opposingMoment. Use the stated units and boundary conventions.
- Run the calculation. Correct any input error before interpreting a result.
- Read appliedMoment, netMoment. Inspect any known, defined, inclusion, or boundary flags before interpreting numeric values.
Compute planar appliedMoment = force*leverArm*sin(angleRadians), then subtract opposingMoment for netMoment. Require nonnegative force and lever arm.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| force | Force | Required. Finite number; minimum 0. |
| leverArm | Lever Arm | Required. Finite number. |
| angleRadians | Angle Radians | Required. Finite number. |
| opposingMoment | Opposing Moment | Required. Finite number. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| appliedMoment | Applied Moment | Required. Finite number. |
| netMoment | Net Moment | Required. Finite number. |
{
"input": {
"force": 100,
"leverArm": 0.2,
"angleRadians": 1.5707963267948966,
"opposingMoment": 5
},
"output": {
"appliedMoment": 20,
"netMoment": 15
}
}Limitations and assumptions
- Angle is in radians and moments need compatible force-times-length units. This is an ideal phantom mechanics term rather than a patient's strength, joint loading assessment, or exercise recommendation.
- The field tables describe structural bounds; the mechanics also state cross-field requirements. Malformed input shapes, disallowed keys, and invalid domains cause input errors. Results must remain finite and within the declared output contract. A successful false flag or zero placeholder is distinct from an error.
- Numeric arithmetic uses binary floating point. Exact comparisons have no hidden tolerance or decimal rounding; negative zero is exported as zero. Decimal-text integer operations retain the exactness specifically stated above.
Alternative or Complementary methods
For joint phantom moment arm force term, check the source records and the supplied rule before comparing the result with another method. Use an appropriately validated measurement or analysis method for clinical interpretation.
References
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