Uniform circular motion statements

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SUMMARY

The discussion centers on the characteristics of uniform circular motion, specifically identifying which statement is false. The correct answer is b: "net force is zero," as an object in uniform circular motion requires a net inward force to maintain its circular path, contradicting Newton's First Law. Other statements regarding constant kinetic energy, zero net work, constant magnitude of acceleration, and non-constant momentum are confirmed as true. The analysis emphasizes the necessity of centripetal force in circular motion.

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flynostrich08
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Homework Statement



Which of the following is not true in relation to an object moving in uniform circular motion?
a. KE of the object is constant
b. net force is zero
c. net work is zero
d. the magnitude of acceleration is constant
e. momentum is non-constant


The Attempt at a Solution



at first i thought it was e. but then i believe momentum relies on velocity which would not make it true so i believe the best answer is b. but not a 100% sure why
 
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Your choice of B is correct because if there were no forces, the object would travel in a straight line path rather than a circular one, i.e. Newtons 1st Law. The must be some net force that is directed toward the center of the circle which is either tension or some other agency keeping the particle in circular motion. Hope that helps.

Joe
 

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