物体G重为400N,沿着长为4m,高位2m的斜面将物体匀速从底端推到顶端,如果推力F为250N,求:(1)物体与斜面之间的摩擦力.(2)推力F做的功.
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![物体G重为400N,沿着长为4m,高位2m的斜面将物体匀速从底端推到顶端,如果推力F为250N,求:(1)物体与斜面之间的摩擦力.(2)推力F做的功.](/uploads/image/z/6681758-14-8.jpg?t=%E7%89%A9%E4%BD%93G%E9%87%8D%E4%B8%BA400N%2C%E6%B2%BF%E7%9D%80%E9%95%BF%E4%B8%BA4m%2C%E9%AB%98%E4%BD%8D2m%E7%9A%84%E6%96%9C%E9%9D%A2%E5%B0%86%E7%89%A9%E4%BD%93%E5%8C%80%E9%80%9F%E4%BB%8E%E5%BA%95%E7%AB%AF%E6%8E%A8%E5%88%B0%E9%A1%B6%E7%AB%AF%2C%E5%A6%82%E6%9E%9C%E6%8E%A8%E5%8A%9BF%E4%B8%BA250N%2C%E6%B1%82%EF%BC%9A%EF%BC%881%EF%BC%89%E7%89%A9%E4%BD%93%E4%B8%8E%E6%96%9C%E9%9D%A2%E4%B9%8B%E9%97%B4%E7%9A%84%E6%91%A9%E6%93%A6%E5%8A%9B.%EF%BC%882%EF%BC%89%E6%8E%A8%E5%8A%9BF%E5%81%9A%E7%9A%84%E5%8A%9F.)
物体G重为400N,沿着长为4m,高位2m的斜面将物体匀速从底端推到顶端,如果推力F为250N,求:(1)物体与斜面之间的摩擦力.(2)推力F做的功.
物体G重为400N,沿着长为4m,高位2m的斜面将物体匀速从底端推到顶端,如果推力F为250N,求:
(1)物体与斜面之间的摩擦力.
(2)推力F做的功.
物体G重为400N,沿着长为4m,高位2m的斜面将物体匀速从底端推到顶端,如果推力F为250N,求:(1)物体与斜面之间的摩擦力.(2)推力F做的功.
W有用=Gh400N*2m=800J
W总=Fs=250N*4m=1000J
W额外=W总-W有用=200J
物体与斜面之间的摩擦力f=W额外/s=200J/4m=50N
推力F做的功就是总功=1000J