Simple harmonic as projection of circular motion is considered one of the most asked concept.
7 Questions around this concept.
Two particles are executing simple harmonic motion of the same amplitude $A$ and frequency $\omega$ along the $x$-axis. Their mean position is separated by distance $X_0\left(X_0>A\right)$. If the maximum separation between them is $\left(X_0+A\right)$, the phase difference between their motion is
A simple pendulum performs simple harmonic motion about $x=0$ with an amplitude $A$ and time period $T$. The speed of the pendulum at $x=\frac{A}{2}$ will be
The circle's radius, the period of revolution, the initial position and sense of revolution are indicated in Fig.
Y-projection of the radius vector of rotating particle P is:
Two particles are performing simple harmonic motion in a straight line about the same equilibrium point. The amplitude and time period for both particles are same and equal to A and T, respectively. At time t = 0 one particle has displacement A while the other one has displacement $\frac{-A}{2}$ and they are moving towards each other. If they cross each other at time t, then t is :
The radius of the circle, the Period of revolution, the initial Position, and the sense of revolution are indicated in Figure Y. The Projection of the radius vector of a rotating particle P is:

Simple harmonic can be represented as a projection of circular motion.
If P moves uniformly on a circle as shown in the below figure, then its projection P′ on a diameter of the circle executes SHM.
As the particle P moves on the circle, The position of P′ on the x-axis is given by
x(t) = A cos (ωt + φ)
This is the equation of SHM on the $\times$-axis with amplitude $A$ and angular frequency as $\omega$ Where $A$ is the radius of the circle and $\phi$ is the angle that the radius OP makes with the $\times$-axis at $t=0$
Similarly, The position of P′ on the y-axis is given by
y(t)= A sin (ωt + φ)
This is also an SHM of the same amplitude as that of the projection on the x-axis, but differing by a phase of π/2.
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