question: A piece of sandpaper was rubbed across a glass table, then the sandpaper was rubbed across some gravel. The friction will be less between
choices.text: the sandpaper and the glass table or the sandpaper and the gravel.
choices.label: A B
para: Rougher surfaces have more friction between them than smoother surfaces.
para_anno.effect_prop: friction
para_anno.cause_dir_str: rougher
para_anno.effect_dir_str: more
para_anno.cause_dir_sign: MORE
para_anno.effect_dir_sign: MORE
para_anno.cause_prop: surface roughness
question_anno.less_effect_dir: less
question_anno.less_cause_prop: glass table
question_anno.less_effect_prop: friction
question_anno.less_cause_dir: friction