If the object is pulled to the right, the spring will be stretched and exert a restoring force to return to the weight to the equilibrium position. This position is the middle, where the spring is not exerting any force either to the left or to the right. The position shown in the illustration is the equilibrium position. The spring is considered to be weightless. The surface supports the object so its weight (the force of gravity) doesn’t get involved in the forces. This motion is also known as simple harmonic motion, often denoted as SHM.Ī useful design for examining SHM is an object attached to the end of a spring and laid on a surface. When we speak of a vibration or oscillation, we mean the motion of an object that repeats itself, back and forth, over the same path. Many objects vibrate or oscillate – an object on the end of a spring, a tuning fork, the balance wheel of a watch, a pendulum, the strings of a guitar or a piano.
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