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如果一个物体受到的回复力F与它离开平衡位置的位移x之间的关系为F=-kx(其中k是常量,负号表示二者方向相反),那么这个物体做简谐运动.这个关系式常用于判断一个物体是否做简谐运动.
If the relation between the restoring force F of an object and the displacement x of its departure from the equilibrium position is F=-kx (where k is a constant and the negative sign indicates the opposite direction), then the object performs a simple harmonic motion. The formula is often used to determine whether an object performs simple harmonic motion.