STEM PRACTICE AND EVIDENCE WORKBENCH
Compare signed simultaneous interaction-force pairs and audit equal-and-opposite claims with a transparent residual.
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
For one interaction pair, force A on B plus force B on A should be approximately zero in the shared axis. Scaled residual percentage equals the absolute pair sum divided by the larger force magnitude times one hundred. Equal and opposite means that residual is within tolerance; the yes-or-no learner claim is then compared with that result. Supported means the supplied pair claim matches both magnitude and opposite-direction evidence. It does not mean the two forces cancel on one object because they act on different bodies. Review interaction labels, simultaneity, vector direction, calibration, contact duration, uncertainty, and separate free-body diagrams before connecting the pair with acceleration.
Confirm the question, source, units, notation, response coding, model assumptions, and review threshold. Keep an unchanged copy of the original evidence.
Run the worked example, inspect every intermediate row, and compare it with a hand calculation, diagram, representation, or approved subject method.
Record the method, assumptions, units, classifications, and flagged rows. Verify the editable report independently before educational or laboratory use.
How to interpret the result
Use when learners or teachers need to distinguish a third-law pair from forces that happen to appear on the same free-body diagram. The workbench checks numerical pair evidence only. It does not identify interaction partners from a picture, compare nonsimultaneous readings, determine a net force, calibrate sensors, resolve two-dimensional vectors, or establish experimental validity.
The cart-contact values 12 and negative 12.1 have a residual below two percent, and the magnet pair also agrees. The hand-wall pair differs by ten percent and its no claim is supported. The final pair uses two same-sign forces, so the sum is large and its yes claim is flagged.
For one interaction pair, force A on B plus force B on A should be approximately zero in the shared axis. Scaled residual percentage equals the absolute pair sum divided by the larger force magnitude times one hundred. Equal and opposite means that residual is within tolerance; the yes-or-no learner claim is then compared with that result.
Supported means the supplied pair claim matches both magnitude and opposite-direction evidence. It does not mean the two forces cancel on one object because they act on different bodies. Review interaction labels, simultaneity, vector direction, calibration, contact duration, uncertainty, and separate free-body diagrams before connecting the pair with acceleration.
Do not pair weight with normal force merely because they may balance, place both third-law forces on one object, ignore signs, compare readings from different times, require the objects to have equal acceleration, or say a larger object exerts the larger interaction force. Name actor and receiver for each force and verify timing and axes.
Learning boundary
This browser-local workbench applies only the disclosed rules. It cannot diagnose a learner, certify an experiment, 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 approved school system.
No. It describes entered evidence under one disclosed rule. Review reasoning, uncertainty, access, and several evidence sources.
Treat it as an editable calculation aid. Show your own reasoning, cite required sources, and follow course and academic-integrity rules.
YOUR NIRMION
