A spring hangs vertically, its bottom a distance hUnstretched above the ground.

Question

A spring hangs vertically, its bottom a distance
hUnstretched above the ground. You hang a weight on it and let the
weight down till the weight hangs stationary at a distance hb (for
balanced) above the ground. Then you start the weight oscillating,
above and below the height hb, but so that the spring in its oscillation
never goes as high as hUnstretched. The height h above the ground
varies, so the amount the spring is stretched, x, varies correspondingly.
At what point, if any, in its oscillation is the force exerted by the spring
on the weight in the downward direction, and at what point, if any, is the
potential energy stored in the spring zero? Briefly explain

Explanation / Answer

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