When an object is resting, wether it be on the ground, on a platform or suspended, or even if it is moving at a constant speed, the object is said to be in equilibrium. that is, unless a net force acts on the object, it will continue to do whatever it is doing, wether that be staying at rest or continuing its movement. so, when an object is at equlilbrium, all forces acting on the object are negated by an equal and opposite force. this wind chime is hangng from a ceiling by a string. because it is currently at reast, it is at equilibrium. in the abscenece of a breeze, there is no force to move i horozontally, while the string it is suspended from delivers exactly enough force to negate the downward pull of gravity.
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