Understanding Uniform Circular Motion

Uniform circular motion describes an object moving in a perfect circle at a constant speed. Although the speed is constant, the velocity changes because the direction of motion is continuously changing.

Analyzing Motion Examples

Let's examine each option to see which fits the definition of uniform circular motion:

• A person walking in a straight line: This is linear motion, not circular.
• A ball thrown vertically upwards: This is linear motion (vertical projectile motion).
• A car moving on a straight road: This is linear motion.
• A satellite orbiting the Earth: A satellite follows an orbit around the Earth. While orbits are often elliptical, a simplified model assumes a circular path. If the satellite maintains a constant speed along this circular path, it exemplifies uniform circular motion.

Identifying the Correct Example

Based on the analysis, the motion of a satellite orbiting the Earth is the best example of uniform circular motion among the choices provided, assuming a near-circular orbit and constant speed.