Asked by ABAINEH
Which of the following is not true about a uniform circular motion? A. The direction of the velocity continuously changes B. The magnitude of the velocity continuously changes C. The direction of the acceleration continuously changes D. The magnitude of the acceleration remains constant
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Answer: B.
Explanation: In uniform circular motion the speed (magnitude of velocity) is constant, so its magnitude does not change. The velocity's direction does change continuously (A true). The acceleration is centripetal (points toward the center), so its direction also changes continuously (C true), while its magnitude a = v^2/r is constant (D true).
Explanation: In uniform circular motion the speed (magnitude of velocity) is constant, so its magnitude does not change. The velocity's direction does change continuously (A true). The acceleration is centripetal (points toward the center), so its direction also changes continuously (C true), while its magnitude a = v^2/r is constant (D true).
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