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一、类平抛运动在力学上的应用[例1] 光滑斜面倾角为θ,长为L,上端一小球沿斜面水平方向以速度v0抛出,如图1所示,求小球落到底端时,水平方向上的位移多大? [解析] 小球在斜面上运动只受到重力和支持力的作用,F合=mg sinθ,与初速度v0垂直,可见,小球是作类平抛运动.将小球的运动分解为:①小球在水平方向上不受力,做匀速直线运
First, the type of flat-throw motion in the application of the mechanics [Example 1] The smooth slope angle θ, length L, the top of a small ball along the slope of the horizontal direction with speed v0 thrown, as shown in Figure 1, seeking the ball to the end At the end of time, what is the displacement in the horizontal direction? [Analysis] The movement of the ball on the slope is only affected by gravity and supporting force, F = mg sin θ, perpendicular to the initial velocity v0. It can be seen that the ball is a kind of flat-throwing motion. Decompose the ball’s movement into: 1 The ball does not exert force in the horizontal direction, and it performs a straight line operation.