[{"id": 1, "type": "multiple_choice", "skill": "forces", "options": ["13 N", "7 N", "30 N", "3.3 N"], "question": "According to Newton's Second Law, F = ma. If mass is 10 kg and acceleration is 3 m/s², what is the force?", "difficulty": "medium", "explanation": "F=ma=10×3=30 N.", "needs_review": false, "correct_answer": "30 N"}, {"id": 2, "type": "true_false", "skill": "friction", "question": "Friction is a force that opposes motion.", "difficulty": "easy", "explanation": "Friction acts between surfaces in contact and resists sliding.", "needs_review": false, "correct_answer": "True"}, {"id": 3, "type": "written_response", "skill": "application", "question": "Based on what you learned about Forces and Motion, describe one real-world application. Explain the science behind it in at least 3-4 sentences.", "difficulty": "medium", "explanation": "", "needs_review": true, "correct_answer": null}, {"id": 4, "type": "true_false", "skill": "scientific method", "question": "A hypothesis must be testable and falsifiable.", "difficulty": "easy", "explanation": "Scientific hypotheses must be testable through experiments or observations.", "needs_review": false, "correct_answer": "True"}, {"id": 5, "type": "true_false", "skill": "scientific method", "question": "A hypothesis must be testable and falsifiable.", "difficulty": "easy", "explanation": "Scientific hypotheses must be testable through experiments or observations.", "needs_review": false, "correct_answer": "True"}, {"id": 6, "type": "true_false", "skill": "scientific method", "question": "A hypothesis must be testable and falsifiable.", "difficulty": "easy", "explanation": "Scientific hypotheses must be testable through experiments or observations.", "needs_review": false, "correct_answer": "True"}, {"id": 7, "type": "true_false", "skill": "scientific method", "question": "A hypothesis must be testable and falsifiable.", "difficulty": "easy", "explanation": "Scientific hypotheses must be testable through experiments or observations.", "needs_review": false, "correct_answer": "True"}, {"id": 8, "type": "true_false", "skill": "scientific method", "question": "A hypothesis must be testable and falsifiable.", "difficulty": "easy", "explanation": "Scientific hypotheses must be testable through experiments or observations.", "needs_review": false, "correct_answer": "True"}]