Describing Motion in Physics

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Questions and Answers

Qu'est-ce qu'une trajectoire ?

  • La distance parcourue par un objet en mouvement.
  • La vitesse moyenne d'un objet en mouvement.
  • La durée du mouvement d'un objet.
  • La forme du chemin suivi par un objet en mouvement. (correct)

Dans un référentiel terrestre, quelle est la trajectoire d'une balle lancée verticalement vers le haut ?

  • Une droite horizontale.
  • Un cercle.
  • Une droite verticale. (correct)
  • Une parabole.

Quelle grandeur physique permet de décrire la rapidité d'un mouvement ?

  • La force.
  • La vitesse. (correct)
  • La trajectoire.
  • L'accélération.

Quelle est l'unité de la vitesse dans le Système International (SI) ?

<p>m/s (D)</p> Signup and view all the answers

Si un objet se déplace à vitesse constante, que peut-on dire de son mouvement?

<p>Sa vitesse ne change pas. (D)</p> Signup and view all the answers

Quel est le rôle d'un référentiel en physique ?

<p>Définir un point de vue pour décrire le mouvement. (B)</p> Signup and view all the answers

Quelle est la trajectoire d'un point sur la roue d'une bicyclette dans le référentiel du cycliste ?

<p>Un cercle. (A)</p> Signup and view all the answers

Si un objet parcourt 100 mètres en 10 secondes, quelle est sa vitesse moyenne ?

<p>10 m/s (C)</p> Signup and view all the answers

Quelle est la différence entre la vitesse instantanée et la vitesse moyenne ?

<p>La vitesse instantanée est la vitesse à un instant précis, tandis que la vitesse moyenne est calculée sur un intervalle de temps. (A)</p> Signup and view all the answers

Quel type de mouvement décrit un objet en chute libre (sans frottement) ?

<p>Un mouvement rectiligne uniformément accéléré. (C)</p> Signup and view all the answers

Flashcards

What is a trajectory?

The path followed by an object in motion.

Trajectory of a ball thrown upwards?

A straight line, directed vertically.

What describes the rapidity of motion?

The rate at which an object changes its position.

SI unit of velocity?

Meters per second (m/s).

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Motion at constant velocity?

Its velocity remains constant.

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Role of a frame of reference?

To provide a perspective for describing motion.

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Trajectory on bicycle wheel (cyclist frame)?

A circle.

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Average speed: 100m in 10s?

10 m/s

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Instantaneous vs. average speed?

Instantaneous speed is at a precise moment; average speed is over an interval.

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Motion of a free-falling object?

Uniformly accelerated rectilinear motion.

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Study Notes

  • The text is a questionnaire that covers the basics of describing movements in physics.

Trajectory

  • Trajectory refers to the shape of the path followed by an object in motion.

Trajectory of Vertically Launched Ball

  • The trajectory of a ball launched vertically upwards in Earth's frame of reference is a vertical line.

Describing Speed of Movement

  • Speed describes how fast a movement is.

SI Unit of Speed

  • The SI unit for speed is meters per second (m/s).

Object Moving at Constant Speed

  • When an object moves at a constant speed, its velocity does not change.

Role of a Frame of Reference in Physics

  • A frame of reference is used to define a point of view for describing movement.

Trajectory of a Point on a Bicycle Wheel

  • The trajectory of a point on a bicycle wheel in the cyclist's frame of reference is a circle.

Calculating Average Speed

  • An object travels 100 meters in 10 seconds, its average speed is 10 m/s.

Instantaneous Speed vs. Average Speed

  • Instantaneous speed is the speed at a precise instant, while average speed is calculated over an interval of time.

Motion of an Object in Free Fall

  • An object in free fall (without friction) undergoes uniformly accelerated rectilinear motion.

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