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Angular acceleration is the rate of change of angular velocity. In SI units, it is measured in radians per second squared (rad/s^{2}), and is usually denoted by the Greek letter alpha (α).^{[1]}
The angular acceleration can be defined as either:
where {\omega} is the angular velocity, a_T is the linear tangential acceleration, and r, (usually defined as the radius of the circular path of which a point moving along), is the distance from the origin of the coordinate system that defines \theta and \omega to the point of interest.
For two-dimensional rotational motion (constant \hat L), Newton's second law can be adapted to describe the relation between torque and angular acceleration:
where {\tau} is the total torque exerted on the body, and I is the mass moment of inertia of the body.
For all constant values of the torque, {\tau}, of an object, the angular acceleration will also be constant. For this special case of constant angular acceleration, the above equation will produce a definitive, constant value for the angular acceleration:
For any non-constant torque, the angular acceleration of an object will change with time. The equation becomes a differential equation instead of a constant value. This differential equation is known as the equation of motion of the system and can completely describe the motion of the object. It is also the best way to calculate the angular velocity.
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