根据图像可知小球做周期性的摆动每次经过最低点时
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(2)[3]根据图像可知小球做周期性的摆动每次经过最低点时拉力最大，而最大拉力逐渐变小，说明经过最低点的最大速度逐渐变小，则主要原因空气阻力做负功，导致机械能有损失;
(3)[4]为了减小因空气阻力带来的误差，应选择密度大体积小的球进行实验。
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为了验证小球在竖直平面内摆动过程的机械能是否守恒
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