Why its happened - spring things

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When a mass on a spring is initially vibrated vertically, it can start to swing horizontally due to the pendulum effect, which is less damped than vertical motion. The vertical vibrations lose energy quickly as heat in the spring, while horizontal motion is primarily damped by air friction. If air friction is removed, the energy remains constant, but the horizontal motion does not increase significantly after vertical damping. The period of the horizontal swing is influenced by the length of the spring, which changes until it stabilizes. Understanding these dynamics reveals the complex interplay between mass, spring stretch, and motion.
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Sometimes after few moments of perpendicularly vibrate the mass hang on a spring, starts vibrate horizontal. I must know why it happened ? any books or answers are see pleasant .
 
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One simple explanation is that the horizontal swings are initially small compared to the vertical, so you don't notice it at first. However the vertical is damped much faster because it involves the stretching of the spring while the horizontal swing is a pendulum effect damped only by air friction.
 
ok it is pendulum effect but how it's happend' for exampel i don't have air friction so the energy is constans, after damped the vertical swings, the horizontal motion will grow big?
and my second question is how the horizontal motion depend on the mass and the stretch of spring ?
 
The energy of the vertical motion gets lost as heat in the spring (otherwise it wouldn't damp). The horizontal motion won't increase.

As for the second question, the period of the swing depends on the length of the spring. Since the length will be variable until it stops springing, the horizontal motion appears to be fairly complicated.
 

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