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单摆也叫做“数学摆”.在细线一端拴一小球 ,另一端固定在悬点上 ,如果线的伸缩和质量可以忽略 ,球的直径比线长短得多 ,就组成了一个单摆 .若空气阻力不计 ,摆角θ5°,单摆的运动就是简谐运动 .由此可见 ,构成单摆必须满足的三个条件是 :(1 )摆球线度比摆线长度短得多 ;(2 )
The pendulum is also called “mathematical pendulum.” One end of the thin line is filled with a small ball, and the other end is fixed at the hanging point. If the line is retracted and the quality is negligible, the diameter of the ball is much shorter than the line length, and a single pendulum is formed. If the air resistance does not account, the swing angle θ5°, the movement of a single pendulum is a simple harmonic motion. Therefore, the three conditions that must be met to form a pendulum are: (1) The pendulum line is much shorter than the length of the cycloid; (2 )