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    Question

    Which of the following is an example of uniform circular

    motion?
    A A car speeding up on a straight highway Correct Answer Incorrect Answer
    B A satellite moving in a circular orbit at constant speed Correct Answer Incorrect Answer
    C A train moving with constant speed on a straight track Correct Answer Incorrect Answer
    D A ball thrown vertically upward Correct Answer Incorrect Answer

    Solution

    Uniform circular motion refers to motion along a circular path at constant speed. Even though the speed remains constant, the direction of velocity continuously changes.  A satellite moving in a circular orbit at constant speed is a classic example: the gravitational force of the planet provides the centripetal force necessary to keep the satellite in its circular path.  

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