Uniform circular motion statements

AI Thread Summary
In uniform circular motion, the kinetic energy of the object remains constant, and the net work done is zero. However, the net force cannot be zero, as a centripetal force is required to maintain circular motion, contradicting option b. The magnitude of acceleration is constant, but the direction changes, affecting momentum, which is non-constant due to the continuous change in velocity direction. The correct answer to the question is b, as a net force is essential for circular motion. Understanding these principles is crucial for analyzing uniform circular motion accurately.
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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Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
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