How Does Torque Affect the Acceleration of a Stick's Tip?

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Homework Help Overview

The discussion revolves around understanding the effects of torque on the acceleration of the tip of a stick, specifically in a scenario where gravity is ignored. The problem involves concepts from rotational dynamics and kinematics, focusing on the relationship between torque, angular acceleration, and linear acceleration at the tip of the stick.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants explore the relationship between centripetal and tangential acceleration, questioning how these components interact when torque is applied. There are discussions about the implications of constraints on the motion of the stick's tip and the potential for non-circular paths if those constraints were removed. Some participants suggest using polar coordinates for clarity, while others express uncertainty about the integration process in both Cartesian and polar systems.

Discussion Status

The discussion is active, with various interpretations being explored regarding the nature of the motion and the forces involved. Some participants provide insights into the use of polar coordinates and the implications of torque on the stick's motion, while others seek clarification on specific equations and concepts. There is no explicit consensus, but several productive lines of inquiry have been established.

Contextual Notes

Participants note the importance of maintaining the assumption of a fixed length for the stick and the role of tension in the stick under applied torque. There is also mention of the complexity introduced by gravity in related scenarios, which may affect the overall analysis.

  • #31
LogicalTime said:
my final result for the acceleration is:
<br /> a_{r} = r\dot{ \theta}^2-g \cos( \theta)<br />
<br /> a_{\theta} = r \ddot{ \theta } - g \sin( \theta)<br />

where
<br /> \ddot{\theta} = \frac{\tau}{I}<br />[/QUOTE

at least the units match up now lol
 
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  • #32
If you did not put mg as part of the net torque, how do you cancel out the normal force from the hinge?
 

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