Understanding Centripetal Net Force in Circular Motion

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Homework Help Overview

The discussion revolves around the concept of centripetal net force in the context of circular motion, specifically when swinging a ball in a horizontal circle. Participants are exploring the relationship between force, acceleration, and the motion of the ball.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning whether the net force acting on the ball is zero due to constant velocity, and if centripetal force is relevant in this scenario. There is also a discussion about the implications of Newton's third law in relation to the forces acting on the ball and the string.

Discussion Status

The discussion is active with participants examining different interpretations of net force and acceleration in circular motion. Some guidance has been provided regarding the nature of forces involved, but there is no explicit consensus on the net force's status.

Contextual Notes

Participants are navigating the definitions of net force and centripetal force, and how these concepts apply to the scenario of a ball being swung in a circle. There is an acknowledgment of the complexity in understanding these forces in relation to motion.

keemosabi
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Homework Statement


If you swing a ball in a horizontal circle around your head, what is the direction and magnitude of the net force acting on the ball?


Homework Equations





The Attempt at a Solution


I said none because the ball is moving at a constant velocity. Is this correct? Or does the centripetal force come into play?
 
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The direction of the force is inward, perpendicular to the velocity at any given moment of time.
 
twotaileddemon said:
The direction of the force is inward, perpendicular to the velocity at any given moment of time.
Is it a net force? If it were, wouldn't the ball be accelerating inward? Doesn't that force just offset the ball pulling on the string?
 
good point.. I didn't see that "net" there.

In that case, I do believe the -net- force is zero, as you said.
 
keemosabi said:
Is it a net force?
yes
If it were, wouldn't the ball be accelerating inward?
yes, it is , in the inward centripetal x direction.
Doesn't that force just offset the ball pulling on the string?
No, that's Newton's 3rd law, the string pulls on the ball, and the ball pulls on the string, with a force equal in magnitude and opposite in direction, always.
 

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