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【简答题】
在 “ 探究二力平衡条件 ” 的实验中,小刚同学采用的实验装置如图甲所示,小采用的实验装置如图乙所示。 ( 1 )当物体处于 ________ 状态或匀速直线运动状态时,它受到的相互平衡的。 ( 2 )在探究力的大小对二力平衡的影响时,通过调整 ________ 来改变 F 1 和 F 2 的大小。 ( 3 )这两个实验装置中,你认为装置 ________ ( 选填 “ 甲 ” 或 “ 乙 ”) 更科学。 ( 4 )在装置,将小车旋转一定角度,松手后,发现小车旋转后又恢复原状,这说明两个力必须作用在同一 ________( 选填 “ 物体 ” 或 “ 直线 ”) 上,物体才能平衡。
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