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单摆是一个物理模型,理想的单摆摆线的伸缩和质量均忽略不计,摆球较重,且球的直径比摆线长度小得多.摆球受到的回复力是重力沿切线方向的分力,即F=mgsinθ,只有当θ<10°时,sinθ≈θ(θ用弧度制表示),单摆的振动才可以作为简谐运动.例1在用单摆测定重力加速度实验中:(1)为了比较准确地测量出当地的重力加速度值,应选
Simple pendulum is a physical model, the ideal single swing cycloid telescopic and the quality are negligible, swing the ball heavier, and the ball diameter is much smaller than the cycloid length. The restoring force of the swing ball is gravity along the tangential direction Component force, that is, F = mgsinθ, only when θ <10 °, sinθ ≈ θ (θ expressed in radians), pendulum vibration can be used as simple harmonic motion Example 1 in the determination of gravitational acceleration with pendulum experiment: (1) In order to more accurately measure the value of local gravity acceleration, should be selected