上坡时:
F1 = f + Gsinθ
P = F1V1 = fV1 + GsinθV1.(1)
下坡时:
F2 = f - Gsinθ
P = F2V2 = fV2 - GsinθV2.(2)
(1)+(2)得:
2P = f(V1+V2)
P = f(V1+V2)/2
平路时:
F=f
P=fV
V ≤ P/f = [f(V1+V2)/2] / f = (V1+V2) / 2
上坡时:
F1 = f + Gsinθ
P = F1V1 = fV1 + GsinθV1.(1)
下坡时:
F2 = f - Gsinθ
P = F2V2 = fV2 - GsinθV2.(2)
(1)+(2)得:
2P = f(V1+V2)
P = f(V1+V2)/2
平路时:
F=f
P=fV
V ≤ P/f = [f(V1+V2)/2] / f = (V1+V2) / 2