第117章代替
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以往征战，北方突厥，多在冬天才发动南侵。
那个时候，秋收已过，粮食入库，能抢到更多的东西，是一个因素。
可最主要的因素，则是冬天大河结冰，突厥的骑兵可以无视中原的水网，肆意在大地之上驰骋。
而缺少骑兵的大唐，根本无力阻拦。
尽管如此，还是有战马倒毙在河畔。那个时候，即便是虚弱的老卒，也能拽着马尾，在大河上面移动。
上千斤算的了什么？
李世民点了点头，说道。
“回皇兄，哪怕是再重点，朕也一样推的动。”
而这个时候，陆然才施施然的继续说道。
“这冰面，和地面，对于巨石来说，其中的差别，就是一个摩擦力。”
“地面的摩擦力巨大，而冰面的摩擦力微小。”
“若是没有这个摩擦力的话，世间的任何东西，只要轻轻一推，就会永远的滑下去。”
“而物理，其中最重要的一个分支，就是研究世间所有的力。”
“如今，人皇有了对力的了解，可有办法，将这块巨石，搬到河边？”
陆然这话说完，李世民的眼睛，瞬间变得无比的明亮。
“力！”
“引力，摩擦力！”
“世间的万物，竟然有如此的解释。”
想明白了这一切的李世民，立刻高喊一声，来人。
话落，矗立一旁的千牛卫立刻涌了上来。
在李世民的指挥之下，巨岩，被撬棍撬起，一截一截的竹子，被砍断，放到了巨岩的下方。
李世民轻轻一推，伴随着竹节的滚动，巨石立刻向前一动。
而落在后方的竹节，又被千牛卫，重新放到了前方。
“呵呵！”
“这样，就能减少摩擦力。”
“想不到，秦人修长城的方法之中，竟然还有这样的道理。”
“朕，真是大开眼界。”
“若是回到长安，朕将重开一监，必为物理监。再开一司，必为力学司。”
“专门研究这关于物理的科学。”
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