So what is simple harmonic motion??
It's the motion of an object if its acceleration is proportional to the displacement of the object from the equilibrium and is always directed towards the equilibrium position.
The acceleration,a,of an object oscillating in simple harmonic motion is given by the equations:
a= -(2пf)²x = -ω²x
It's helpful to think of a pendulum swinging backwards and forwards to help remember how displacement, velocity and acceleration vary.
As
the pendulum swings upwards from the equilibrium position its velocity is
decreasing in other words it's accelerating. The force that makes this happen is a
component of gravity that acts towards the equilibrium position.
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