Model aircraftA model aircraft is a small unmanned aircraft. Many are replicas of real aircraft. Model aircraft are divided into two basic groups: flying and non-flying. Non-flying models are also termed static, display, or shelf models. Aircraft manufacturers and researchers make wind tunnel models for testing aerodynamic properties, for basic research, or for the development of new designs. Sometimes only part of the aircraft is modelled.
Test caseIn software engineering, a test case is a specification of the inputs, execution conditions, testing procedure, and expected results that define a single test to be executed to achieve a particular software testing objective, such as to exercise a particular program path or to verify compliance with a specific requirement. Test cases underlie testing that is methodical rather than haphazard. A battery of test cases can be built to produce the desired coverage of the software being tested.
Matériel roulant ferroviairevignette|Locomotives à vapeur Frisco 2-10-0 et Diesel Burlington Zephyr (USA). vignette|Autorail Billard à voie métrique (France). vignette|Rame automotrice articulée à grande vitesse TGV 2N2 (France). vignette|Rame réversible IC 2000 (Suisse). vignette|Draisine à bras (Italie). Le matériel roulant ferroviaire est composé de l'ensemble des véhicules, moteurs ou remorqués, conçus pour se déplacer sur une voie ferrée.
Contact forceA contact force is any force that occurs as a result of two objects making contact with each other. Contact forces are ubiquitous and are responsible for most visible interactions between macroscopic collections of matter. Pushing a car or kicking a ball are some of the everyday examples where contact forces are at work. In the first case the force is continuously applied to the car by a person, while in the second case the force is delivered in a short impulse.
Véhicule militaire blindéthumb|M109, exemple d'un véhicule militaire blindé. Un véhicule militaire blindé ou véhicule blindé de combat est un véhicule militaire, protégé par un blindage et le plus souvent disposant d’un armement propre. Les véhicules militaires blindés sont classés en fonction de leur rôle prévu sur le champ de bataille et leurs caractéristiques. Ainsi, ils regroupent les chars de combat, automitrailleuses, véhicules de reconnaissance, véhicules de combat d'infanterie, véhicules de transport de troupes, canons automoteur, chasseurs de chars ou encore chenillettes.
