问大家一小段英语Thatseemsodd,butit’seasytodemonstrate.Standonanearlyfrictionless(无摩擦力的)surfacesuchasanoilyfloor,orputonapairofrollerskates(四轮旱冰鞋).Nowtakeastep.Pushashardasyoulike,buttheoi

Question

问大家一小段英语
That seems odd,but it’s easy to demonstrate.Stand on a nearly frictionless(无摩擦力的) surface such as an oily floor,or put on a pair of roller skates(四轮旱冰鞋).Now take a step.Push as hard as you like,but the oil or skates keep that force from being applied to the floor,so there is no opposite,reactive force exerted on your foot.The result:Your legs and feet may struggle to move about,but you don’t move forward.

Answer 1

这看起来似乎很奇怪,但很容易证明.站在一个几乎无摩擦（无摩擦力的）表面如油地板,或穿上一双溜冰鞋（四轮旱冰鞋）.现在采取的一个步骤.把像你一样,但石油或溜冰鞋保持力被施加到地板上,所以没有相反的,对你的脚的反应力.结果：你的腿和脚也会移动,但你不前进.