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为了验证机械能守恒定律,用附图所示的装置作实验。斜槽放在桌上,斜槽下部水平部分的槽口伸出桌边。使质量为m的钢球从斜槽顶端滚下,由槽口飞出。测出h和s以求钢球飞出时的速度v′,再测出H。根据机械能守恒定律。mgH=1/2mv_(?),∴v=(2gH)~(1/2)反复做实验,发现实际测到的v′总比上面计算
In order to verify the law of conservation of mechanical energy, experiments were performed using the apparatus shown in the attached drawings. The chute is placed on the table and the notch in the horizontal part of the chute extends beyond the table edge. A steel ball with mass m rolls off the top of the chute and flies out of the slot. Measure h and s to find the speed v’ when the ball is flying out, and measure H again. According to the law of conservation of mechanical energy. Repeat the experiment with mgH=1/2mv_(?), ∴v=(2gH)~(1/2), and find that the actual measured v’ is always higher than the above calculation.