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Periodic Motion - Coggle Diagram
Periodic Motion
Motion that repeats itself in a definite cycle. It occurs whenever a body has a stable equilibrium position and a restoring force that acts when it is displayed from equilibrium.
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Simple Harmonic Motion (SHM): If the restoring force in periodic motion is directly proportional to the displacement, the motion is called (SHM).
Angular frequency, frequency and period in SHM do not depend on amplitude, but only mass and force constant
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Simple pendulum 
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Resonance: When the frequency difference between the system and that of the external force is minimal, the resultant amplitude of the forced oscillations will be enormous. However, when the two frequencies match or become the same, resonance occurs.
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Angular SHM: the frequency and angular frequency are related to torsion constant and moment of inertia.
Physical pendulum
Damped oscillation: when a force proportional to velocity is added to a simple harmonic oscillator, the motion is called damped oscillation.
Driven Oscillation: when a sinusoidally varying driving force is added to a damped harmonic oscillator, the resulting motion called forced oscillation.
HOOKE'S LAW: Force is negative because it always a restoring force, pulling or pushing opposite direction of displacement.