IB Physics: Oscillations & SHM

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IB Physics Topic 4.1
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Table of Contents
0:00 Restoring force and displacement from equilibrium
1:41 Period and Frequency
3:50 The simplest oscillation: simple harmonic motion
7:43 Conditions for SHM
10:58 Motion Graphs
14:24 Energy Changes in SHM
20:23 Phase
22:10 Phase difference
25:17 Isochronous
26:30 Example 1
26:55 Example 2
27:26 Example 3
28:45 Summary

[advaitkona]

if you had a pendulum above ground, at the equilibrium point wouldn't there also be potential energy? Same for the spring with the block pulling down right? so why is KE the total energy at those points --> i think around 18:30 you said KE at equilibrium is TE? or is it just that for the purpose of the questions its easier to solve if you consider it like that for pendulums?

[maisan]

at 1:14 where is the restoring force getting its energy from? and why does this phenomenon happen?