STEM PRACTICE AND EVIDENCE WORKBENCH
Calculate signed force-to-mass acceleration and audit measured evidence, learner calculations, and consistency claims.
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
Expected signed acceleration equals net external force divided by positive system mass. Percentage residual equals absolute observed minus expected acceleration divided by expected magnitude times one hundred. Observed evidence is locally consistent when the residual does not exceed the entered tolerance; learner acceleration is checked independently against the expected value. Supported means the learner calculation and the consistency classification both agree with the supplied force, mass, observation, and tolerance. A mismatch can indicate sign, net-force, mass, unit, timing, or measurement problems. Review a free-body diagram, vector components, friction, uncertainty, sampling interval, system boundary, and whether acceleration is approximately constant.
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 after force, mass, and acceleration evidence have been collected for a bounded one-dimensional investigation. The workbench separates the expected F divided by m calculation from agreement with observed acceleration. It does not sum force vectors, infer mass, correct a sensor, fit changing acceleration, decide uncertainty, or prove that a system boundary is appropriate.
A four-newton net force on a two-kilogram cart predicts two metres per second squared and the observed 2.02 falls inside three percent. A negative force correctly predicts negative acceleration. The loaded cart observation differs enough to support inconsistent. The final row reverses acceleration sign but claims consistency, so it is flagged.
Expected signed acceleration equals net external force divided by positive system mass. Percentage residual equals absolute observed minus expected acceleration divided by expected magnitude times one hundred. Observed evidence is locally consistent when the residual does not exceed the entered tolerance; learner acceleration is checked independently against the expected value.
Supported means the learner calculation and the consistency classification both agree with the supplied force, mass, observation, and tolerance. A mismatch can indicate sign, net-force, mass, unit, timing, or measurement problems. Review a free-body diagram, vector components, friction, uncertainty, sampling interval, system boundary, and whether acceleration is approximately constant.
Do not divide mass by force, discard a negative direction, use one applied force instead of net force, mix grams and kilograms, compare acceleration before sensors are synchronized, choose tolerance after seeing the result, or call any nonzero force inconsistent. Resolve the net force first, preserve units, calculate independently, and justify uncertainty.
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
