trustme.bro/r/…
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the claim
The normal force is always perpendicular to the surface of contact
the verdict
COMMON KNOWLEDGE
no citation needed for this one
refutedsupported
the weight of evidence
no sources on either side

The statement that the normal force is always perpendicular to the surface of contact is a fundamental definition in classical mechanics, meaning no citation is needed.

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The analysis

The claim defines 'normal force' (from 'norm', meaning perpendicular) as the component of a contact force that is perpendicular to the common boundary of the two interacting objects. This is a basic definition by everyday observation and introductory physics, making it common knowledge rather than an empirical hypothesis requiring literature verification.

Everything we examined (12)
  1. Study on stability analysis of soil nail reinforced slopes under loading based on the discrete element method.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  2. Control of Friction Laws in Tangential Adhesive Contacts by Surface Geometry.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  3. Modeling method and verification of interface contact stiffness based on micro-surface morphology detection.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  4. Rapid coronary artery stent computational simulation using the simplex deformable model.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  5. Friction Modeling of Tendon-driven Continuum Robots through Linear Complementarity Problem.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  6. Three-Dimensional PNP-FEM of a Layered IPMC Artificial Skin Under Finger-like Sliding for Robotic Tactile Interfaces.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  7. Doxorubicin-driven reconfiguration of BSA-cushioned DPPC liposomes an integrated molecular-dynamics and AFM roadmap for next-generation drug-delivery platforms.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  8. A solution algorithm for calculating the preload of T-type clamp bolts based on multiphysics coupling.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  9. Small nanoparticles, surface geometry and contact forces.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  10. Elastohydrodynamics of the eyelid wiper.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  11. Role of Trapped Molecules at Sliding Contacts in Lattice-Resolved Friction.peer-reviewedno side takennot shown: read and judged not to bear on this claim
  12. Lateral and Normal Capillary Force Evolution of a Reciprocating Liquid Bridge.peer-reviewedno side takennot shown: read and judged not to bear on this claim
The paper trail · every fact has a biography
first checked05 Aug 2026
judged → COMMON KNOWLEDGE · 9505 Aug 2026
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