For a uniform circular motion, velocity is along the tangent, and acceleration is towards the centre of the circle.
The movement of a body following a circular path is called a circular motion. Now, the motion of a body moving with constant speed along a circular way is called Uniform Circular Motion. If a particle is moving in a circle, it must have some acceleration acting towards the centre, making it move around the centre. Since this acceleration is perpendicular to the velocity of a particle at every instant, it is only changing the direction of velocity and not magnitude, and that’s why the motion is a uniform circular motion. Few examples are:
- The motion of electrons around its nucleus.
- The motion of blades of the windmills.
- The tip of the second’s hand of a watch with a circular dial shows a uniform circular motion.