STEM MODEL AND EVIDENCE WORKBENCH
Model inverse-square gravitational field, potential, and test-mass force at explicit radii around a spherical source.
Review output
Load the worked example to inspect realistic inputs, or enter anonymous classroom or laboratory evidence. Results remain in this browser tab until you copy or download them.
Transparent method
Field magnitude is G M divided by r squared. Potential per unit test mass is negative G M divided by r with zero at infinity. Force magnitude on the supplied test mass is field times test mass. Claim error compares the entered field with the full-precision model before display rounding. A claim within one percent matches the ideal model and entered constants. It does not validate the source data or establish measured local gravity. Use ratios to explain inverse-square behavior, check center-based radius, and distinguish the mass-independent field from force that scales with test mass.
Confirm the task, approved source, units, notation, signs, model assumptions, and review threshold. Keep an unchanged copy of measurements or learner responses.
Run the worked example, inspect every intermediate row, and compare the result with a hand calculation, diagram, physical model, periodic table, or approved laboratory method.
Record the method, assumptions, uncertainty, units, classifications, and flagged rows. Verify the editable report independently before instruction, assessment, or laboratory use.
How to interpret the result
Use for a classroom inverse-square comparison around an ideal spherical or point source. It can test radius scaling and distinguish field from force and potential. It does not model an interior field, nonspherical mass, rotation, other bodies, atmospheric forces, relativistic effects, orbit integration, navigation, or spacecraft safety.
The example uses an Earth-like mass and SI gravitational constant. The surface reference is near 9.82, doubling center radius reduces field to one quarter, and tripling radius reduces it to one ninth. A fourth point at four radii claims 1.00 although the model is near 0.614, so it is flagged.
Field magnitude is G M divided by r squared. Potential per unit test mass is negative G M divided by r with zero at infinity. Force magnitude on the supplied test mass is field times test mass. Claim error compares the entered field with the full-precision model before display rounding.
A claim within one percent matches the ideal model and entered constants. It does not validate the source data or establish measured local gravity. Use ratios to explain inverse-square behavior, check center-based radius, and distinguish the mass-independent field from force that scales with test mass.
Do not use altitude as center radius, square the mass, confuse potential with field, omit the negative potential sign convention, or treat force and field as the same quantity. Keep constant, mass, radius, and test-mass units compatible and do not use classroom results for trajectory decisions.
Learning boundary
This browser-local workbench applies only the disclosed rules. It cannot diagnose learning, certify an experiment, identify a substance, establish a structure, or replace teacher, laboratory, and safety judgment.
Review checklist
Practical questions
No. Processing occurs in the current browser tab. Avoid personal information and retain authoritative records only in the school-approved system.
No. It describes entered evidence under one disclosed rule. Compare several evidence sources and ask for reasoning before drawing a conclusion.
Treat it as an editable calculation aid. Show your own reasoning, cite required sources, and follow the course method and academic-integrity rules.
YOUR NIRMION
