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例1 如图1,倾角为30°的传送带以恒定的速度2m/s运动,皮带AB长5m.将质量为1kg的物体放在A点,经2.9s到达B点,求物体和皮带间的动摩擦因数μ为多少?若增加皮带的速度,则物体从A运动到B的最短时间是多少?(g=10m/s2) 分析物体沿皮带上滑,运动情况可能是先加速后匀速,或者是一直加速,我们用平均速度来确定. 设物体一直加速上滑,则物体到达B点时的速
Example 1 As shown in Figure 1, a conveyor belt with a 30° angle of inclination moves at a constant speed of 2m/s. The belt AB is 5m long. Place an object with a mass of 1kg at point A and reach it at point B after 2.9s. Find the object and the belt. What is the dynamic friction factor μ? If the speed of the belt is increased, what is the minimum time the object moves from A to B? (g=10m/s2) The analysis object slides up the belt, and the movement may be uniform after acceleration, or Accelerate, we use the average speed to determine. Let the object speed up the slide, then the speed at which the object reaches point B