CBSE PHYSICS: IX Motion And Rest Formative Check Points For FA-01..:

Q. Define terms (i) One radian (ii) Angular displacement (iii) Angular velocity

Q. Define terms (i) One radian (ii) Angular displacement (iii) Angular velocity

Answer: One radian is defined as the angle subtended at the centre of the circle by an arc equal in length to its radius.

Angular displacement : In a circular motion, the angular displacement of a body is the angle subtended by the body at the centre in a given interval of time. It is represented by the symbol q (theta).

Angular velocity : The angular displacement per unit time is called the angular velocity. it is represented by the symbol w(omega).

Angular velocity w = q/t

In figure, the arc AB of the circle has length l and subtends an angle q at the centre C

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