In a spring pendulum, the acceleration of a body changes from one moment in time to another, from one point to another point of the trajectory. What is the reason for this change in acceleration?
The elastic force acting on the body is proportional to the elongation of the spring. Because the elongation is different at different points, then the elastic force has different meanings. The acceleration of the body is proportional to the force, therefore, the acceleration also depends on the displacement.
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