Quiz — Exercice 2 Vitesse de glissment A1.pdf

Question 1 sur 10 20:00

[{"id":65451,"question":"Quelle formule permet de calculer la vitesse de glissement entre deux surfaces ?","option_a":"Vg = V1 + V2","option_b":"Vg = V1 - V2","option_c":"Vg = V1 × V2","option_d":"Vg = V1 \/ V2","option_e":"","option_f":"","bonne_reponse":"b","explication":"La vitesse de glissement est la différence entre les vitesses des deux surfaces en contact : Vg = V1 - V2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vg = V1 + V2\", \"b\": \"Vg = V1 - V2\", \"c\": \"Vg = V1 × V2\", \"d\": \"V","_debug_options_count":4},{"id":65452,"question":"Si un objet glisse à 5 m\/s sur une surface elle-même en mouvement à 3 m\/s dans le même sens, quelle est la vitesse de glissement ?","option_a":"2 m\/s","option_b":"8 m\/s","option_c":"15 m\/s","option_d":"1.67 m\/s","option_e":"","option_f":"","bonne_reponse":"a","explication":"La vitesse de glissement est Vg = 5 m\/s - 3 m\/s = 2 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\": \"2 m\/s\", \"b\": \"8 m\/s\", \"c\": \"15 m\/s\", \"d\": \"1.67 m\/s\"}}","_debug_options_count":4},{"id":65453,"question":"La vitesse de glissement dépend-elle des forces de frottement ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Oui, les forces de frottement influencent la vitesse de glissement en modifiant les vitesses relatives des surfaces.","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":65454,"question":"Quel est l'unité de la vitesse de glissement dans le système international ?","option_a":"m\/s²","option_b":"m\/s","option_c":"N","option_d":"kg","option_e":"","option_f":"","bonne_reponse":"b","explication":"L'unité de la vitesse est le mètre par seconde (m\/s), comme pour toute vitesse.","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\/s²\", \"b\": \"m\/s\", \"c\": \"N\", \"d\": \"kg\"}}","_debug_options_count":4},{"id":65455,"question":"Si deux surfaces glissent l'une contre l'autre avec la même vitesse mais en sens opposés, quelle est la vitesse de glissement ?","option_a":"0 m\/s","option_b":"V1 + V2","option_c":"V1 - V2","option_d":"V1 × V2","option_e":"","option_f":"","bonne_reponse":"b","explication":"La vitesse de glissement est la somme des vitesses car elles sont opposées : Vg = V1 + V2.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"0 m\/s\", \"b\": \"V1 + V2\", \"c\": \"V1 - V2\", \"d\": \"V1 × V2\"}}","_debug_options_count":4},{"id":65456,"question":"La vitesse de glissement peut-elle être négative ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Oui, une vitesse de glissement négative indique un changement de sens de glissement.","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":65457,"question":"Quel phénomène physique limite la vitesse de glissement maximale ?","option_a":"La gravité","option_b":"Les forces de frottement","option_c":"La pression atmosphérique","option_d":"La température","option_e":"","option_f":"","bonne_reponse":"b","explication":"Les forces de frottement limitent la vitesse de glissement en dissipant l'énergie cinétique.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"La gravité\", \"b\": \"Les forces de frottement\", \"c\": \"La pression ","_debug_options_count":4},{"id":65458,"question":"Si un objet glisse à 4 m\/s sur une surface fixe, quelle est sa vitesse de glissement ?","option_a":"4 m\/s","option_b":"0 m\/s","option_c":"8 m\/s","option_d":"2 m\/s","option_e":"","option_f":"","bonne_reponse":"a","explication":"La vitesse de glissement est égale à la vitesse de l'objet car la surface est fixe : Vg = 4 m\/s - 0 m\/s = 4 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\": \"4 m\/s\", \"b\": \"0 m\/s\", \"c\": \"8 m\/s\", \"d\": \"2 m\/s\"}}","_debug_options_count":4},{"id":65459,"question":"La vitesse de glissement est-elle toujours inférieure à la vitesse absolue de l'objet ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Non, elle peut être supérieure si la surface en contact a une vitesse opposée et élevée.","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":65460,"question":"Quel outil mathématique est essentiel pour calculer la vitesse de glissement ?","option_a":"La dérivée","option_b":"L'intégrale","option_c":"La soustraction vectorielle","option_d":"La multiplication matricielle","option_e":"","option_f":"","bonne_reponse":"c","explication":"La soustraction vectorielle est utilisée pour calculer la vitesse de glissement entre deux vecteurs vitesses.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"La dérivée\", \"b\": \"L'intégrale\", \"c\": \"La soustraction vectori","_debug_options_count":4}]