What is meant by uniform circular motion? Give its two examples.

A constant speed body moving in a circle, the motion of this body will be called uniform circular motion. In case of uniform circular motion, the speed is constant but velocity is changing every instant. If a particle is moving in uniform circular motion: 1) Its speed is constant 2) Velocity is changing at every instant 3) There is no tangential acceleration 4) Radial (centripetal) acceleration = Ï?*Ï?*r 5) v=Ï?*r. These are Some examples of uniform circular motion. 1. A moving hand of a clock, 2. A blade of a fan, 3. The revolution of the Earth, 4. A film tape on the projector. read less

Uniform circular motion can be described as the motion of an object in a circle at a constant speed. As an object moves in a circle, it is constantly changing its direction. At all instances, the object is moving tangent to the circle. Since the direction of the velocity vector is the same as the direction of the object's motion, the velocity vector is directed tangent to the circle as well. The animation at the right depicts this by means of a vector arrow. An object moving in a circle is accelerating. Accelerating objects are objects which are changing their velocity - either the speed (i.e., magnitude of the velocity vector) or the direction. An object undergoing uniform circular motion is moving with a constant speed. Nonetheless, it is accelerating due to its change in direction. The direction of the acceleration is inwards. The animation at the right depicts this by means of a vector arrow. read less