六、汽车的行驶阻力在一般行驶情况下,作用在汽车上的外力有:重力;行驶阻力;道路的法向反作用力和切向反作用力。若以∑表示汽车行驶时迁到的各种阻力之和,则汽车行驶的基本条件是: ∑=_k 汽车行驶阻力有:滚动阻力;空气阻力;坡度阻力和加速阻力四种。 (一)、滚力阻力整个汽车的滚动阻力R_f,是各个车轮滚动阻力之和。作用在左、右车轮上的阻力一般是 Sixth, the driving resistance of the car In general driving circumstances, the role of the external forces in the car are: gravity; driving resistance; the road of the normal reaction force and tangential reaction force. If Σ represents the sum of all kinds of resistance that the vehicle moves to when moving, the basic conditions for driving a car are as follows: Σ = _k The running resistance of the car is: rolling resistance; air resistance; slope resistance and acceleration resistance. (A), rolling resistance The rolling resistance of the car R_f, is the sum of the rolling resistance of each wheel. The drag on the left and right wheels is generally