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InformationUDP datagram service

UDP exchanges addressed messages without adding reliable stream delivery.

DefinitionInformationDNS names, records and caching

DNS distributes typed resource records through a delegated naming hierarchy.

DefinitionInformationCombinational digital-circuit model

A combinational output depends on current valid inputs after a bounded settling delay.

ModelInformationBoolean gates and truth tables

Logic gates compute Boolean functions with truth values 0 and 1.

DefinitionInformationClocked storage and sequential state

Sequential circuits retain state, so current inputs alone do not determine their behavior.

ModelInformationStored programs and instruction sets

Stored instructions control computation through a specified hardware/software interface.

ModelPhysicsDisplacement, distance and average speed

Displacement compares endpoints; distance measures the travelled path.

ModelPhysicsConstant-acceleration kinematics

Closed formulas require constant acceleration over the interval.

ModelPhysicsInertial reference frames and inertia

Newtonian force balances need an inertial frame or explicit inertial terms.

ModelPhysicsCircular motion and centripetal acceleration

A constant speed can still have an acceleration.

ModelPhysicsMass, gravitational weight and apparent weight

Mass is in kilograms; gravitational weight is a force.

ModelPhysicsNormal forces and tension

Contact geometry determines the force direction.

ModelPhysicsFree-body diagrams and system boundaries

List forces on the selected body once.

ModelPhysicsStatic and kinetic dry friction

Static friction is a responsive force with an approximate limit.

ModelPhysicsFluid drag and terminal speed

Terminal speed depends on the chosen drag model.

ModelPhysicsImpulse and momentum transfer

Time-integrated net force changes momentum.

ModelPhysicsElastic and inelastic collisions

Momentum conservation and kinetic-energy conservation are different.

ModelPhysicsConservative forces and potential energy

Potential-energy differences encode path-independent work.

ModelPhysicsMechanical-energy conservation and dissipation

Mechanical energy is only part of the total energy.

ModelPhysicsHooke’s spring model and elastic energy

A linear spring restores displacement toward equilibrium.

ModelPhysicsMechanical power

Power measures the rate of work or energy transfer.

ModelPhysicsRigid-body rotational kinetic energy

Rotation stores kinetic energy determined by mass distribution.

ModelPhysicsRolling without slipping

No slip constrains velocity at the contact point.

ModelPhysicsStatic equilibrium and torque balance

Zero net force alone does not prevent rotation.

ModelPhysics · Earth & cosmosYoung, shear and bulk elastic moduli

Stress and strain need a loading geometry and a constitutive range.

ModelPhysicsDensity and fluid pressure

Density is mass per volume; pressure is normal force per area.

ModelPhysicsAbsolute, gauge and differential pressure

A zero gauge reading need not be a vacuum.

ModelPhysicsPascal’s principle and ideal hydraulics

A pressure change is transmitted; pressure need not be equal at different heights.

ModelPhysicsNewtonian viscosity and Poiseuille flow

Viscosity relates shear stress to velocity gradient.

ModelPhysics · ChemistrySurface tension and capillary rise

Interface forces can support pressure jumps and capillary columns.

Model
ModelSource checked

Combinational digital-circuit model

Information

A combinational output depends on current valid inputs after a bounded settling delay.

Key knowledge

A combinational device specifies an output logic value for each valid input combination and a maximum propagation delay. Once inputs remain stable and valid for that delay, outputs match the specification. An acyclic connection of such devices can itself be combinational.

Conditions and scope

  • Logic 0 and 1 are abstractions represented by specified physical ranges; intermediate levels may be invalid.
  • Respect component and operating specifications. The model does not guarantee outputs during input transitions or before settling.

Engineering abstraction subject to component, environment and timing specifications; no perfect-hardware assertion.

Sources · 1

References

Sources retain their recorded scope. A source link alone does not establish verification of every statement.

  1. The Digital Abstraction, 5.2–5.4 and 5.8Steve Ward / MIT Computation StructuresCourse notescomputationstructures.orgRead source

Evidence and review

Checked the stated combinational digital-circuit model and restrictions against the listed primary sections; exact inspected boundaries are in the author receipt.

2026-10-10 · Independent Physics and Measurement reference editor (AI editorial bounded review). Independent AI editorial review of this entry's statements, equations, applicability conditions and source coverage. Source checks apply to these claims within their stated limits.

Related reference entries

Explore relationships within this area of study and its connections to other areas.

Showing 1–3 of 3 relationships

Scientific relationships · 3 / 3

The relationship type describes the connection. Its linked statements, sources and conditions define the scope.

  1. Related to
    Relationship sources · 1

    Linked statements

    • A combinational device specifies an output logic value for each valid input combination and a maximum propagation delay. Once inputs remain stable and valid for that delay, outputs match the specification. An acyclic connection of such devices can itself be combinational.

    A physical digital signal implements abstract 0/1 values under valid-level and timing specifications.

  2. Related to
    Relationship sources · 1

    Linked statements

    • AND returns 1 exactly when both inputs are 1; inclusive OR returns 1 when at least one is 1; NOT exchanges 0 and 1. Two-input XOR returns 1 exactly when inputs differ. A truth table specifies every input combination; AND, OR and NOT suffice to express any finite-input Boolean function.

    A truth table or Boolean expression is the functional part of a combinational-device specification.

  3. Related to
    Relationship sources · 1

    Linked statements

    • Sequential circuits use stored state in addition to current inputs. An edge-triggered flip-flop captures a data bit on its specified active clock edge; clocked registers combine such elements to store several bits. Reliable capture requires stable valid data through the specified setup and hold window.

    Clocked sequential systems combine stored state with combinational processing.

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