Active vocabulary

frequency of revolution period of revolution

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частота обертання період обертання

uniform circular motion

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рівномірний рух по колу

If the angular speed ωof a rigid body is constant, the equation for u tells us that the linear speed υ for any point within it is also constant. Thus each point within the body undergoes uniform circular motion. The period of revolu­tion T for the motion of each point and for the rigid body itself is given by the equation: An angular velocity characterizes the rate of change of the angular displacement. There is an average (mean) angular velocity and an instantaneous angular velocity.

The period of revolution, or simply the period, of the motion.
It is, in general, the time for a particle to go exactly around on closed path

This equation tells us that the time for one revolution is the distance travelled by a point in one revolution divided by the speed at which that distance is traveled. Substituting for uand canceling r, we find also that

This equivalent equation says that the time for one revolution is the angle rad traversed in one revolution divided by the angular speed at which that angle is traversed.

Frequency of rotation п isthe number of revolution per time unit.

or .

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