Quiz — Cinématique série 3.pdf

Question 1 sur 10 20:00

[{"id":52729,"question":"Un mobile se déplace à vitesse constante de 20 m\/s pendant 5 secondes. Quelle est la distance parcourue ?","option_a":"100 m","option_b":"50 m","option_c":"25 m","option_d":"40 m","option_e":"","option_f":"","bonne_reponse":"a","explication":"La distance parcourue est calculée par la formule : distance = vitesse × temps = 20 m\/s × 5 s = 100 m.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"100 m\", \"b\": \"50 m\", \"c\": \"25 m\", \"d\": \"40 m\"}}","_debug_options_count":4},{"id":52730,"question":"L'accélération d'un mobile est nulle si sa vitesse est constante.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Si la vitesse est constante, l'accélération est bien nulle, car l'accélération mesure la variation de la vitesse.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":52731,"question":"Quelle équation décrit un mouvement uniformément accéléré ?","option_a":"x(t) = x₀ + v₀t","option_b":"x(t) = x₀ + v₀t + ½at²","option_c":"x(t) = v₀t + ½at²","option_d":"x(t) = x₀ + at","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'équation d'un mouvement uniformément accéléré est : x(t) = x₀ + v₀t + ½at², où x₀ est la position initiale, v₀ la vitesse initiale et a l'accélération.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"x(t) = x₀ + v₀t\", \"b\": \"x(t) = x₀ + v₀t + ½at²\", \"c\": \"","_debug_options_count":4},{"id":52732,"question":"Un projectile est lancé horizontalement à une vitesse de 10 m\/s. Quelle est sa trajectoire ?","option_a":"Rectiligne","option_b":"Parabolique","option_c":"Circulaire","option_d":"En ligne brisée","option_e":"","option_f":"","bonne_reponse":"b","explication":"La trajectoire d'un projectile lancé horizontalement est parabolique, car il est soumis à l'accélération de la pesanteur.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Rectiligne\", \"b\": \"Parabolique\", \"c\": \"Circulaire\", \"d\": \"En lign","_debug_options_count":4},{"id":52733,"question":"L'accélération centripète est toujours dirigée vers le centre de la trajectoire.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"L'accélération centripète est bien dirigée vers le centre de la trajectoire, car elle permet de maintenir le mouvement circulaire.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":52734,"question":"Quelle est l'unité de l'accélération dans le système international ?","option_a":"m\/s","option_b":"m\/s²","option_c":"m²\/s","option_d":"m²\/s²","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'unité de l'accélération dans le système international est le mètre par seconde au carré (m\/s²).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"m\/s\", \"b\": \"m\/s²\", \"c\": \"m²\/s\", \"d\": \"m²\/s²\"}}","_debug_options_count":4},{"id":52735,"question":"Un mobile a une vitesse initiale de 5 m\/s et une accélération de 2 m\/s². Quelle est sa vitesse après 3 secondes ?","option_a":"11 m\/s","option_b":"10 m\/s","option_c":"12 m\/s","option_d":"9 m\/s","option_e":"","option_f":"","bonne_reponse":"a","explication":"La vitesse finale est calculée par : v = v₀ + at = 5 m\/s + (2 m\/s² × 3 s) = 11 m\/s.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"11 m\/s\", \"b\": \"10 m\/s\", \"c\": \"12 m\/s\", \"d\": \"9 m\/s\"}}","_debug_options_count":4},{"id":52736,"question":"La trajectoire d'un mobile est toujours une droite.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La trajectoire d'un mobile peut être une droite, une courbe ou une parabole, selon les forces qui s'appliquent sur lui.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":52737,"question":"Quelle formule permet de calculer la vitesse moyenne ?","option_a":"v = d\/t","option_b":"v = t\/d","option_c":"v = d × t","option_d":"v = d + t","option_e":"","option_f":"","bonne_reponse":"a","explication":"La vitesse moyenne est calculée par la formule : v = d\/t, où d est la distance parcourue et t le temps écoulé.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"v = d\/t\", \"b\": \"v = t\/d\", \"c\": \"v = d × t\", \"d\": \"v = d + t\"}}","_debug_options_count":4},{"id":52738,"question":"Un mobile est en mouvement rectiligne uniforme. Son accélération est-elle nulle ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un mobile en mouvement rectiligne uniforme a une vitesse constante, donc son accélération est nulle.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4}]