首先不考虑绳子的拉力,对两个物体做受力分析:
则有:(m+M)a=F-(m+M)gsinθ-u(m+M)gcosθ
解得:a=[F-(m+M)gsinθ-u(m+M)gcosθ]/(m+M)=F/(m+M)-g(sinθ+ucosθ)
对后一个物体做受力分析:
设:绳子的拉力为:T
则有:am=T-mgsinθ-umgcosθ
T=mF/(m+M)-gm(sinθ+ucosθ)-mg(sinθ+ucosθ)=mF/(m+M)-2gm(sinθ+ucosθ)
首先不考虑绳子的拉力,对两个物体做受力分析:
则有:(m+M)a=F-(m+M)gsinθ-u(m+M)gcosθ
解得:a=[F-(m+M)gsinθ-u(m+M)gcosθ]/(m+M)=F/(m+M)-g(sinθ+ucosθ)
对后一个物体做受力分析:
设:绳子的拉力为:T
则有:am=T-mgsinθ-umgcosθ
T=mF/(m+M)-gm(sinθ+ucosθ)-mg(sinθ+ucosθ)=mF/(m+M)-2gm(sinθ+ucosθ)