[问题一]如图1所示,倾角α=60°的光滑斜面.质量为m的小球,用一轻绳连结放在斜面上.当斜面以向右的加速度a运动时,绳的张力和球对斜面的压力各是多大? [分析]由于我们不知道当斜面以题所给的加速度运动时,小球所处状态——是否离开了斜面?若离开,绳与水平夹角多大?因此,小球的受力情况也就不能做 [Question 1] As shown in Fig. 1, a smooth slope with an inclination angle α=60°, a ball with a mass of m is attached to a slope with a light rope, and the tension of the rope when the slope is moved with acceleration a to the right. And how much pressure does the ball have on the slope?[Analysis] Because we don’t know when the slope is moving with the acceleration given by the question, is the ball in the state—is it off the slope? If so, how much is the angle between the rope and the horizon? Therefore, the ball’s stress can’t be done