# Lec8 - General Physics ROTATIONAL KINEMATICS Circular...

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General Physics Dr. Brahmia 1 ROTATIONAL KINEMATICS Circular Motion Angular displacement ( ) is measured in degrees, revolutions or radians. The radian is used most often. The angular displacement is given by where r is the radius and s is the length of arc in the circle. r s t ROTATIONAL KINEMATICS… t Angular velocity Angular velocity ( ) is measured in radians per second. The average angular velocity is measured by dividing the angular displacement by the time required to travel through the angular displacement Angular acceleration. Angular acceleration ( ) is measured in radians/s 2 . The average angular acceleration is defined as the rate of change of the angular velocity ( ) in time. t

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General Physics Dr. Brahmia 2 The total linear acceleration of a particle traveling in a circle is where a c is the centripetal acceleration known as c T a a a r r v a c 2 2
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