有这样一个能量转化问题 :一质量为M、长度为l、表面粗糙的平板车在光滑水平面上始终保持速度v0做匀速直线运动 ,一质量为m的滑块 (视为质点 )以初速度v(vv0 )从车的左端滑至右端正好相对于平板车静止 (如图 1所示 ) .求 :在此过程中滑块有多少动能通过摩擦生热转化成了内能 ? There is such an energy conversion problem: a flat-bed vehicle with mass M, length l, and rough surface always maintains the velocity v0 in a smooth horizontal plane to perform a uniform linear motion, and a mass m slider (regarded as a particle) with an initial velocity v ( Vv0 ) Sliding from the left end of the car to the right end happens to be stationary with respect to the flatbed (as shown in Fig. 1). Finding: How much kinetic energy of the slider is converted into internal energy by frictional heat in the process?