Motor vehicles need energy to accelerate (overcome inertia), to push the air out of their way (aerodynamic drag), and to overcome the friction from tires, wheels and axles (rolling resistance).

 
  • 帶發(fā)動(dòng)機的車(chē)輛需要能量進(jìn)行加速(克服慣性阻力),推開(kāi)路上的空氣(空氣動(dòng)力學(xué)拖曳力),并克服輪胎、車(chē)輪和車(chē)軸的摩擦力(滾動(dòng)阻力)。
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