## Circular Motion – Class 11 | Chapter – 5 | Physics Short Notes Series PDF for NEET & JEE

Circular Motion: Circular motion refers to the motion of an object along a circular path. In circular motion, the object moves at a constant speed around a fixed point or axis. The direction of motion of the object is constantly changing, but the speed remains the same. This means that there is a constant acceleration towards the center of the circular path, known as the centripetal acceleration. This acceleration is caused by a force called the centripetal force, which is directed towards the center of the circle and is required to keep the object moving in a circular path.

## Types of Circular Motion

There are two types of circular motion: uniform circular motion and non-uniform circular motion.

• Uniform Circular Motion: Uniform circular motion occurs when an object moves around a circular path with a constant speed. In this case, the direction of motion is constantly changing, but the magnitude of the velocity remains constant. The acceleration of the object is directed towards the center of the circle and is constant in magnitude, but changes direction as the object moves around the circle. Examples of uniform circular motion include the motion of a satellite in orbit around the Earth or the motion of a ball attached to a string and being swung around in a circle.
• Non-uniform Circular Motion: Non-uniform circular motion occurs when an object moves around a circular path with a varying speed. In this case, the magnitude and direction of the velocity of the object change as it moves around the circle. The acceleration of the object is still directed towards the center of the circle, but its magnitude can vary. Examples of non-uniform circular motion include the motion of a car moving around a circular track at varying speeds or the motion of a planet around the sun, where its speed changes as it moves in its elliptical orbit.

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