《物理教学》2007年第12期上刊登了“一对静摩擦力的功到底多大?”一文,原文如下: 如图1所示,平板车放在光滑的水平面上,一个人从车的左端加速向右端跑动,设人受到的摩擦力为 F,平板车受到的 The article “Physics Education” published in the 12th issue of 2007 reads “How big is the power of static friction?” as follows: As shown in Figure 1, a flatbed car is placed on a smooth horizontal surface and a person is from the left end of the car. Accelerate the movement to the right end, set the person to receive the friction force F, the flatbed is affected by