Multi-Body Friction: Acceleration Impact

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SUMMARY

The discussion centers on the dynamics of friction between two accelerating bodies, specifically when one body (B) rests on another (A) that is accelerating on a frictionless surface. When A accelerates, B initially moves with A due to static friction. However, if the applied force on A exceeds the static friction force, B will begin to slide in the opposite direction due to kinetic friction. The conversation raises questions about the effects of releasing the force on A and how it influences the acceleration of both A and B.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Knowledge of static and kinetic friction concepts
  • Familiarity with basic mechanics of multi-body systems
  • Concept of acceleration and force interactions
NEXT STEPS
  • Study the principles of Newton's second law of motion in multi-body systems
  • Explore the mathematical modeling of friction forces in accelerating systems
  • Learn about the effects of friction on relative motion between objects
  • Investigate advanced topics in dynamics, such as Lagrangian mechanics
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Physics students, mechanical engineers, and anyone interested in the principles of dynamics and friction in multi-body systems.

BaneOfGodot
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How does friction work between two objects that are both accelerating at different accelerations?
 
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I think you are going to need to explain your question in more detail - and provide an attempt to answer it yourself.
 
It's a conceptual question.
For example, if B is on A (each has mass), and A is on a surface with no friction, then as A accelerates, how would friction work between A and B?
My guess is this: When A accelerates, initially B will accelerate with it as a single body system. However, if the force exerted on A is greater than the force of static friction between A and B, then B will begin accelerating in the opposite direction of the force accelerating A. The force accelerating B is the kinetic friction between A and B.
If the force on A is released, though, will the friction between A and B accelerate A in the opposite direction? And how will this affect the acceleration of B?
 

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