Question: how does increased friction affect the actual mechanical advantage of a machine
[{'answer': 'reduce the mechanical advantage', 'provenance': [{'wikipedia_id': '20616', 'title': 'Mechanical advantage', 'start_paragraph_id': 56, 'start_character': 306, 'end_paragraph_id': 56, 'end_character': 337, 'bleu_score': 1.0, 'section': 'Section::::Efficiency.\n'}]}, {'provenance': [{'wikipedia_id': '20616', 'title': 'Mechanical advantage', 'start_paragraph_id': 56, 'start_character': 0, 'end_paragraph_id': 56, 'end_character': 519, 'bleu_score': 0.9208977726789741, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18374303257551688802}, 'section': 'Section::::Efficiency.\n'}]}]