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研究下面两个问题。问题一、在倾角为α的斜面上,放一质量为 m 的光滑小球,球被竖直的木板挡住,则(1)球对竖直挡板的压力是多大?(2)若把竖直的挡板拿开,那么小球的瞬时加速度是多大?一些书上是这样解的:
Study the following two questions. Question 1. On a slope with an inclination of α, place a smooth ball with a mass of m. The ball is blocked by a vertical board. (1) How much pressure does the ball have on the vertical baffle? The straight baffle is lifted, then what is the instantaneous acceleration of the ball? Some books do this: