And the way that pendulum has simple harmonic motion is with the angle displacement from the vertical. Um, in this mess, we have em and as to label it, um and this mass is suspended in air, so it's under the influence of gravity. The second example of simple harmonic motion is a pendulum. K x caving the stiffness of the spring and X being the displacement of the object. So the restoring force that causes the simple harmonic motion is negative. That's usually how we depict the horizontal mass spring system, the masses, an equilibrium and according to the displacement, away from the equilibrium, there will be a restoring force that acts in opposite direction. So you have a spring here, and the spring has a, uh, stiffness called the spring constant, or K, and the mass has a mass M. The 1st 1 is a horizontal mass that's connected to a spring. There are four examples of simple harmonic motion.
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