Physics: Linear Momentum & Angular Momentum of Rigid Body

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Discussion Overview

The discussion revolves around the concepts of linear momentum and angular momentum in the context of rigid bodies, particularly focusing on the effects of applying force at different points on the body. The scope includes theoretical understanding and clarification of fundamental principles in physics.

Discussion Character

  • Conceptual clarification, Technical explanation

Main Points Raised

  • One participant questions whether applying a force to a point on a rigid body other than the center of mass affects linear momentum and angular momentum differently, specifically asking if linear momentum changes as if the force was applied at the center of mass.
  • Another participant asserts that the acceleration of the center of mass is determined by F = ma, indicating that linear momentum changes in accordance with this principle, regardless of the force's application point.
  • A further inquiry is made about whether conservation laws for linear momentum and angular momentum are calculated differently, suggesting a distinction in their treatment.
  • Another participant confirms that linear momentum and angular momentum are indeed different quantities and are computed differently.

Areas of Agreement / Disagreement

Participants generally agree that linear momentum and angular momentum are distinct and that the application of force affects them differently. However, the discussion does not resolve the nuances of how these principles interact in various scenarios.

Contextual Notes

The discussion does not delve into specific mathematical formulations or examples, leaving some assumptions and conditions regarding the application of forces and the resulting changes in momentum unspecified.

ridefast42
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Well I took physics last year(sophomore year in high school) and the kinametics section is extremely primitive because it had to be done without calculus. So we mainly just covered linear motion, F=ma stuff.My question is, if you apply a force to a point on a rigid body other than the center of mass, does the linear momentum change according to F=ma still while the angular momentum changes by torque induced by the same force?In other words, does the linear momentum change as if the force was exerted at the center of mass?
 
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Yes. The acceleration of the center of mass is given by F = ma, regardless of where the force is applied.
 
Does this also mean that conservation of linear momentum and conservation of angular momentum are calculated differently?

Thanks.
 
Being different quantities, linear momentum and angular momentum are certainly computed differently. (If that's what you're asking.)
 
I see now.Thank you for your replies.
 

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