TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

Because the gyroscope is supported as a pendulum, the support point, the center of mass of the gyroscope, and the center of the earth tend to lie along the same straight, vertical line.  4, record 1, English, - center%20of%20mass%20of%20the%20gyroscope

Record number: 1, Textual support number: 2 CONT

Gravity acting on the center of mass of the gyroscope causes a torque at the gyroscope's point of contact with the surface on which it is resting. If you spun the gyroscope perfectly vertically, it wouldn’t do that(until friction perturbed it) because the force would be acting directly through the center of mass, nor would it precess like that if it were in free fall(because it is not in contact with any surface capable of inducing a torque).  5, record 1, English, - center%20of%20mass%20of%20the%20gyroscope

Record number: 1, Textual support number: 1 OBS

Center of Mass - This is the point at which the entire mass of an object is centered.  6, record 1, English, - center%20of%20mass%20of%20the%20gyroscope

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 CONT

Gyros de références inertielles : Admettons que le montage de Cardan est idéal et le centrage de O parfait, c'est-à-dire que O est à la fois le point de croisement des axes des articulations et le centre d'inertie du gyro. Dans ces conditions en l'absence de tout couple moteur le gyro ne reçoit aucun couple et donc son axe reste inertiellement fixe.  2, record 1, French, - centre%20de%20masse%20du%20gyroscope

Record number: 1, Textual support number: 1 OBS

En pratique, le gyroscope est formé par un disque installé dans une monture à cardan qui permet la liberté de mouvement dans toutes les directions. Si le gyroscope est bien équilibré, c'est-à-dire si son centre de masse est exactement au centre de la suspension, son axe de rotation conservera sa direction par rapport aux étoiles fixes.  4, record 1, French, - centre%20de%20masse%20du%20gyroscope

Record number: 1, Textual support number: 2 OBS

centre de masse : Point auquel est associée une masse égale à la masse d'un système donné tel que par rapport à tous les plans, le moment statique de ce point soit égal à celui du système.  5, record 1, French, - centre%20de%20masse%20du%20gyroscope

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 OBS

If in a gravitational field you support a rotating body in only a single point that is not the center of gravity(center of mass), there is a torque acting on it; if the rotation is fast enough to be associated with a substantial angular momentum and the change in angular momentum effected by that torque is comparatively small, you will observe precession. Gyroscopes used for navigation have to be suspended in their center of gravity and in a way that when changing direction of the box(airplane) around it no torque is applied through that suspension.  2, record 2, English, - gyroscope%20suspended%20off%20center%20of%20gravity

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 CONT

Précession : cas d'un gyroscope non suspendu en son centre de gravité. Supposons que [...] le centre de gravité G au lieu de se trouver confondu avec le point de suspension du gyroscope se trouve en un point de l'axe de celui-ci différent du point de suspension. [...] On dit que le gyroscope précessionne. L'application d'une force (ici le poids) provoque le déplacement du moment cinétique du gyroscope perpendiculairement à cette force; c'est ce que l'on appelle souvent l'effet gyroscopique qui désoriente fréquemment ceux qui ont affaire pour la première fois avec le gyroscope.  1, record 2, French, - gyroscope%20non%20suspendu%20en%20son%20centre%20de%20gravit%C3%A9

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 CONT

The motion of the gyroscope can be seen as a special kind of a pendulum swing. The swing is not a straight one which passes underneath the suspension point. It is constantly deviated to the side and returns back earlier to the same height.  2, record 3, English, - gyro%20suspension%20point

Record number: 3, Textual support number: 1 OBS

If in a gravitational field you support a rotating body in only a single point that is not the center of gravity(center of mass), there is a torque acting on it; if the rotation is fast enough to be associated with a substantial angular momentum and the change in angular momentum effected by that torque is comparatively small, you will observe precession. Gyroscopes used for navigation have to be suspended in their center of gravity and in a way that when changing direction of the box(airplane) around it no torque is applied through that suspension.  3, record 3, English, - gyro%20suspension%20point

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 CONT

Précession : cas d'un gyroscope non suspendu en son centre de gravité. Supposons que [...] le centre de gravité G au lieu de se trouver confondu avec le point de suspension du gyroscope se trouve en un point de l'axe de celui-ci différent du point de suspension.  1, record 3, French, - point%20de%20suspension%20du%20gyroscope

Record 3,  Textual support,  Spanish