What Forces Affect the Speed of a Ball in Circular Motion?

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Homework Help Overview

The discussion revolves around a physics problem involving circular motion, specifically analyzing the forces acting on a ball swinging in a vertical circle. The original poster presents a scenario with a ball of known mass and string length, along with the tension force at a specific point in the motion.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the use of free body diagrams (FBD) to analyze the forces acting on the ball. There are questions about the relevant equations and how to relate the known forces to find the speed of the ball.

Discussion Status

The conversation is active, with participants offering guidance on starting points for analysis, such as drawing FBDs and summing forces. There is acknowledgment of confusion regarding the equations needed to solve the problem, indicating a collaborative effort to clarify the approach.

Contextual Notes

Participants mention specific forces acting on the ball, including tension and gravitational force, and reference pseudo-forces related to circular motion, suggesting a deeper exploration of the concepts involved.

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A 500 g ball swings in a vertical circle at the end of a 1.5-m-long string. When the ball is at the bottom of the circle, the tension in the string is 15 N.



What is the speed of the ball at that point?
 
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what have you done so far? did you draw a fbd with the ball at the bottom of the circle? Did you sum the forces acting on the ball at that point? I'd say start there and see if you get an answer.

Good luck.
 
yea i have done the FDB but I am totally lost on the equations for the problem, i don't know how to find the speed with the "knowns" that i have been given.
 
Well, you have 15N acting toward the center of the circular path and 4.905N acting down. Do you know of any pseudo-forces associated with circular motion? Do you know what force keeps a person stuck to the walls of one of those spinning amusement park rides, or the force you feel when a car goes around a corner?
 

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