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# What is rotational equilibrium?

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Rotational equilibrium occurs when an object is either not rotating and remains at rest or is rotating at a constant rate – all torques acting on an object have a net value of zero, and there's no rotational acceleration. This occurs due to the rotational analogue to Newton's first law: an object at rest or in motion continues in the same state unless acted on by an unbalanced torque.

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In rotational equilibrium, all torques that are acting on an object must be balanced. For example, a torque applied that would spin an object clockwise has to be counteracted by a torque of equal strength that would spin the object counterclockwise. This doesn't necessarily mean all torques acting on the object must be equal to each other, just that each torque needs its equal but opposite force. Although Newton's laws of motion describe the dynamics of linear motion and forces, the same laws govern rotational motion. Torque is the rotational equivalent of force, which causes an object to have rotational acceleration. In addition, torque occurs due to a force applied on a lever arm perpendicular to the axis of rotation. Rotational equilibrium can be seen where there are equal weights on a balanced plane spinning at a fixed speed.

## Related Questions

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The law of inertia is a fundamental physics principle used to describe how an object behaves in motion or at rest, particularly when forces are applied to it. The object can be anything that has mass.

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The law of inertia states that an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. The law of inertia is sometimes referred to as Newton's first law of motion.

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According to the Physics Classroom, projectile motion occurs when an object that is at rest or something close to rest is projected or dropped. An object under projectile motion is an object upon which the only acting force is gravity.