Calculating the angle using angular acceleration

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Discussion Overview

The discussion revolves around calculating the change in angle over time using angular acceleration and torque, with a focus on the integration of these quantities. Participants explore the relationship between angular acceleration, angular velocity, and angular displacement.

Discussion Character

  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant inquires about the possibility of calculating the change in angle with respect to time given a time-varying angular acceleration and torque, along with a fixed moment of inertia.
  • Another participant suggests that if the angular acceleration is known as a function of time and the initial angular velocity is provided, one can integrate to find angular velocity and subsequently integrate again to find the change in angle.
  • A participant asserts that the initial angular velocity is zero since the object starts from equilibrium, and confirms that integrating angular acceleration yields angular velocity.
  • There is a clarification that integrating angular velocity results in angular displacement, which is the change in angle.

Areas of Agreement / Disagreement

Participants generally agree on the method of integration to find angular velocity and displacement, but there is no consensus on the initial conditions or the specific equations to use.

Contextual Notes

The discussion does not resolve the specific equations needed for the calculations, nor does it clarify the assumptions regarding the relationship between torque, moment of inertia, and angular acceleration.

james6008
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Hi

I have calculated angular acceleration which changes with time. I also have a moment(torque) which also changes with time and a fixed moment of inertia. Is there an equation or a way for me to work out the change in angle with respect to time using this information? If not, what other information do I need?
 
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james6008 said:
Hi

I have calculated angular acceleration which changes with time. I also have a moment(torque) which also changes with time and a fixed moment of inertia. Is there an equation or a way for me to work out the change in angle with respect to time using this information? If not, what other information do I need?
If you know the angular acceleration as a function of time and you know the initial angular velocity at time zero, you can integrate with respect to time to get the angular velocity as a function of time. Then you can integrate again to get the change in angle with respect to time.

Chet
 
The initial angular velocity will always be zero because the object starts moving from equilibrium.
So integrating angular acceleration gives me angular velocity. I thought integrating angular velocity will give me displacement/position or am I wrong thinking that?
 
james6008 said:
The initial angular velocity will always be zero because the object starts moving from equilibrium.
So integrating angular acceleration gives me angular velocity. I thought integrating angular velocity will give me displacement/position or am I wrong thinking that?
Integrating angular velocity will give you angular displacement (aka change in angle).

Chet
 
Perfect. Thanks for your help.
 

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