What of the following is an example of object moving under uniform circular motion? I. Motion of the Moon II. Motion of the Earth

Correct option is B

The correct answer is (B) Both I and II

Explanation:
• Uniform circular motion occurs when an object travels a circular path at a constant speed.
• Although the speed is constant, the velocity is continuously changing because the direction of motion is changing at every point. This means circular motion is always an accelerated motion.
• Motion of the Moon (I): The Moon revolves around the Earth in a nearly circular orbit at a relatively constant speed, which is a classic example of uniform circular motion provided by the centripetal force of Earth's gravity.
• Motion of the Earth (II): Similarly, the Earth's revolution around the Sun is approximately a uniform circular motion (though technically elliptical, for basic physics principles, it is treated as uniform circular motion due to its low eccentricity).

Information Booster:
• Centripetal Force: In uniform circular motion, the force acting towards the center is the centripetal force ($$F = mv^2/r$$).
• Examples: A satellite in orbit, a car turning a circular track at constant speed, and the tip of a second hand on a clock.

Additional Knowledge:
• Acceleration: Even though the speed is constant, there is 'centripetal acceleration' directed towards the center of the circle.
• Option A/C/D: Since both celestial motions follow the criteria of traveling a fixed path with a constant speed relative to the central body, excluding one would be scientifically incorrect in the context of general awareness physics.