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[{"id":79242,"question":"Quelle est la formule de la vitesse dans un mouvement rectiligne uniformément accéléré ?","option_a":"v = d\/t","option_b":"v = v0 + a·t","option_c":"v = a·t","option_d":"v = d\/t²","option_e":"","option_f":"","bonne_reponse":"B","explication":"La formule correcte est v = v0 + a·t, où v0 est la vitesse initiale, a l'accélération et t le temps.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":79243,"question":"Un corps en chute libre est soumis uniquement à son poids.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Vrai, en chute libre, on néglige les frottements de l'air.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":79244,"question":"Quelle est l'unité SI de la force ?","option_a":"Newton (N)","option_b":"Joule (J)","option_c":"Pascal (Pa)","option_d":"Watt (W)","option_e":"","option_f":"","bonne_reponse":"A","explication":"L'unité SI de la force est le Newton (N).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":79245,"question":"L'énergie cinétique d'un corps dépend uniquement de sa masse.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"B","explication":"Faux, elle dépend aussi de sa vitesse (Ec = ½·m·v²).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":79246,"question":"Quelle loi régit la conservation de l'énergie mécanique dans un système isolé ?","option_a":"Loi de Newton","option_b":"Loi de conservation de l'énergie","option_c":"Loi de Laplace","option_d":"Loi de Boyle-Mariotte","option_e":"","option_f":"","bonne_reponse":"B","explication":"La loi de conservation de l'énergie stipule que l'énergie totale reste constante dans un système isolé.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":79247,"question":"Un oscillateur harmonique simple a une période indépendante de son amplitude.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Vrai, la période T = 2π√(m\/k) ne dépend pas de l'amplitude.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":79248,"question":"Quelle est la relation entre la puissance (P), la force (F) et la vitesse (v) ?","option_a":"P = F·v","option_b":"P = F\/v","option_c":"P = F·v²","option_d":"P = F²·v","option_e":"","option_f":"","bonne_reponse":"A","explication":"La puissance est donnée par P = F·v, où F est la force et v la vitesse.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":79249,"question":"La tension aux bornes d'un conducteur ohmique est proportionnelle à l'intensité du courant qui le traverse.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Vrai, c'est la loi d'Ohm (U = R·I).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":79250,"question":"Quelle est l'expression de l'énergie potentielle de pesanteur ?","option_a":"Epp = m·g·h","option_b":"Epp = ½·k·x²","option_c":"Epp = m·v²","option_d":"Epp = ρ·g·V","option_e":"","option_f":"","bonne_reponse":"A","explication":"L'énergie potentielle de pesanteur est Epp = m·g·h, où m est la masse, g l'accélération de la pesanteur et h la hauteur.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0},{"id":79251,"question":"Un gaz parfait suit la loi de Boyle-Mariotte à température constante.","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"A","explication":"Vrai, la loi de Boyle-Mariotte stipule que P·V = constante à température constante.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0}]