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在交通事故现场勘察中,我们可以通过大量制动持续作用时间内行驶的距离S,即刹车印迹,就可以推算出汽车在发生事故时的初速度。根据能量守恒定律,汽车原来具有的功能(1/2 mv~2_1)与汽车制动时的摩擦阻力所做的功(P.S)是相等的,即1/2 mv~2=P·S,得V_1=(254(Φ±i)S)~(1/2)公里/小时(上坡路用+号,下坡路用一号,平路为零)。因为汽车在制
In the scene investigation of traffic accidents, we can calculate the initial speed of the car in the event of an accident by braking a large distance S, that is, the distance traveled during the duration of action. According to the law of conservation of energy, the original function of the car (1/2 mv ~ 2_1) is equal to the work (PS) made by the frictional resistance of the car when braking, ie 1/2 mv ~ 2 = P · S V_1 = (254 (Φ ± i) S) ~ (1/2) km / h (+ sign on the uphill, No. 1 on the downslope, zero on the flat road). Because the car in the system