[{"term": "Force", "definition": "A push or pull that can change an object's motion."}, {"term": "Newton's First Law", "definition": "An object at rest stays at rest, and an object in motion stays in motion, unless acted on by an outside force (inertia)."}, {"term": "Newton's Second Law", "definition": "Force equals mass times acceleration (F = ma)."}, {"term": "Newton's Third Law", "definition": "For every action, there is an equal and opposite reaction."}, {"term": "Friction", "definition": "A force that opposes the motion of objects in contact."}, {"term": "Gravity", "definition": "The force of attraction between objects with mass; on Earth, g ≈ 9.8 m/s²."}, {"term": "Acceleration", "definition": "The rate of change of velocity over time."}]