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Which of the following is the best example of uniform circular motion?
A roller coaster on a loop
A racing car on a curved track slowing down
Moon revolving around the Earth in a circular orbit
A yo-yo being swung in a vertical circle at changing speed
Moon revolving around the Earth in a circular orbit
Uniform circular motion occurs when an object moves in a circular path at a constant speed. The moon's revolution around the Earth is a classic example of this, as its orbital speed remains nearly constant while the direction of its velocity changes continuously due to centripetal force.
Uniform circular motion occurs when an object moves in a circular path at a constant speed. The moon's revolution around the Earth is a classic example of this, as its orbital speed remains nearly constant while the direction of its velocity changes continuously due to centripetal force.
The concept of circular motion is governed by Kepler's Laws of Planetary Motion, where the first law states that planets move in elliptical orbits with the Sun at one focus, though circular motion is an idealization often used in physics problems.
Centripetal force is directed toward the center of the circular path.
In uniform circular motion, speed is constant, but velocity is variable because the direction changes at every point.
Acceleration in uniform circular motion is called centripetal acceleration, which is perpendicular to the velocity vector.
Option A is incorrect because a roller coaster on a loop experiences changing speed due to gravity.
Option B is incorrect because a car slowing down undergoes non-uniform motion involving tangential deceleration.
Option D is incorrect because a yo-yo in a vertical circle is subject to changing gravitational potential energy, leading to fluctuating speeds.
The centripetal force keeping the moon in orbit is provided by the Earth's gravitational pull.
C is correct тАФ The Moon revolving around the Earth represents uniform circular motion because its speed remains largely constant while it moves in a stable, nearly circular orbit.
Link this physics concept to Geography by remembering that the Moon's orbital motion influences tidal cycles, a key topic in physical geography and oceanography exams.
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