Quiz — Lycée Pilote Bizerte - mecanique forcées.pdf

Question 1 sur 10 20:00

[{"id":11363,"question":"Quelle loi de Newton stipule que l’accélération d’un corps est proportionnelle à la force nette qui lui est appliquée ?","option_a":"1ère loi de Newton","option_b":"2ème loi de Newton","option_c":"3ème loi de Newton","option_d":"Loi de la gravitation","option_e":"","option_f":"","bonne_reponse":"b","explication":"La 2ème loi de Newton (ΣF = m·a) relie la force nette à l’accélération d’un corps.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"1ère loi de Newton\", \"b\": \"2ème loi de Newton\", \"c\": \"3ème loi","_debug_options_count":4},{"id":11364,"question":"Un corps est en mouvement rectiligne uniforme. Que peut-on dire des forces qui s’appliquent sur lui ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Si le mouvement est uniforme, la somme des forces est nulle (1ère loi de Newton).","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":11365,"question":"Quelle force s’oppose au mouvement d’un corps en contact avec une surface ?","option_a":"Force normale","option_b":"Force de frottement","option_c":"Force de pesanteur","option_d":"Force élastique","option_e":"","option_f":"","bonne_reponse":"b","explication":"La force de frottement s’oppose au mouvement relatif entre deux surfaces en contact.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Force normale\", \"b\": \"Force de frottement\", \"c\": \"Force de pesant","_debug_options_count":4},{"id":11366,"question":"Si un corps de masse 2 kg accélère à 3 m\/s² sous l’effet d’une force, quelle est l’intensité de cette force ?","option_a":"5 N","option_b":"6 N","option_c":"12 N","option_d":"15 N","option_e":"","option_f":"","bonne_reponse":"b","explication":"D’après la 2ème loi de Newton : F = m·a = 2 kg × 3 m\/s² = 6 N.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"5 N\", \"b\": \"6 N\", \"c\": \"12 N\", \"d\": \"15 N\"}}","_debug_options_count":4},{"id":11367,"question":"La force de pesanteur dépend uniquement de la masse du corps.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"La force de pesanteur dépend aussi de l’accélération de la pesanteur (g ≈ 9,81 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\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":11368,"question":"Quel type de mouvement observe-t-on si la somme des forces appliquées à un corps est nulle ?","option_a":"Mouvement accéléré","option_b":"Mouvement rectiligne uniforme","option_c":"Mouvement circulaire","option_d":"Mouvement de rotation","option_e":"","option_f":"","bonne_reponse":"b","explication":"Si ΣF = 0, le corps est en mouvement rectiligne uniforme (1ère loi de Newton).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Mouvement accéléré\", \"b\": \"Mouvement rectiligne uniforme\", \"c\"","_debug_options_count":4},{"id":11369,"question":"Une voiture freine brutalement. Quelle force est responsable de son arrêt ?","option_a":"Force motrice","option_b":"Force de frottement","option_c":"Force de réaction","option_d":"Force centrifuge","option_e":"","option_f":"","bonne_reponse":"b","explication":"La force de frottement entre les pneus et la route permet de freiner la voiture.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Force motrice\", \"b\": \"Force de frottement\", \"c\": \"Force de réact","_debug_options_count":4},{"id":11370,"question":"Si un corps est en équilibre statique, la somme des forces et la somme des moments sont nulles.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Pour un équilibre statique, la somme des forces ET la somme des moments doivent être nulles.","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":11371,"question":"Quelle est l’unité SI de la force ?","option_a":"Joule (J)","option_b":"Newton (N)","option_c":"Watt (W)","option_d":"Pascal (Pa)","option_e":"","option_f":"","bonne_reponse":"b","explication":"L’unité SI de la force est le Newton (N), équivalent à 1 kg·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\": \"Joule (J)\", \"b\": \"Newton (N)\", \"c\": \"Watt (W)\", \"d\": \"Pascal (Pa)","_debug_options_count":4},{"id":11372,"question":"Un corps est soumis à deux forces de même intensité mais de directions opposées. Que peut-on dire de son mouvement ?","option_a":"Il accélère","option_b":"Il est au repos ou en mouvement rectiligne uniforme","option_c":"Il tourne","option_d":"Il ralentit","option_e":"","option_f":"","bonne_reponse":"b","explication":"Si les forces sont égales et opposées, leur somme est nulle : le corps est au repos ou en mouvement rectiligne uniforme.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Il accélère\", \"b\": \"Il est au repos ou en mouvement rectiligne ","_debug_options_count":4}]