Rotating hoop with body fixed inside of same mass

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SUMMARY

The discussion focuses on the dynamics of a small body A fixed inside a thin rigid hoop of radius R, which rolls without slipping on a horizontal plane. The key equation derived is mgcos(θ)−N=mv²/R, where N represents the normal force and v is the velocity of the hoop's center. The critical inquiry is to determine the velocity v0 at which the hoop will roll without bouncing when body A reaches the lower position. The analysis emphasizes the relationship between potential energy and the motion of the hoop and body A.

PREREQUISITES
  • Understanding of rotational dynamics and centripetal force
  • Familiarity with energy conservation principles in physics
  • Knowledge of forces acting on objects in motion
  • Basic grasp of kinematics and dynamics equations
NEXT STEPS
  • Study the principles of rolling motion and conditions for rolling without slipping
  • Explore the concept of potential energy in rotational systems
  • Investigate the effects of centripetal force on objects in circular motion
  • Learn about the dynamics of rigid bodies and their motion equations
USEFUL FOR

Students studying classical mechanics, physics educators, and anyone interested in the dynamics of rolling objects and energy conservation in rotational systems.

lavankohsa
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Homework Statement



A small body A is fixed to the inside of a thin rigid hoop of radius R and mass equal to that of the body A. The hoop rolls without slipping over a horizontal plane; at the moments when the body A gets into the lower position, the center of the hoop moves with velocity v0. At what values of v0 will the hoop move without bouncing?



Homework Equations


mgcos(θ)−N=mv2/R
One equation will be the energy equation. The velocity of hoop and mass A will reduce as the body A is gaining the potential energy.

The Attempt at a Solution

 

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lavankohsa said:

Homework Statement



A small body A is fixed to the inside of a thin rigid hoop of radius R and mass equal to that of the body A. The hoop rolls without slipping over a horizontal plane; at the moments when the body A gets into the lower position, the center of the hoop moves with velocity v0. At what values of v0 will the hoop move without bouncing?



Homework Equations


mgcos(θ)−N=mv2/R
One equation will be the energy equation. The velocity of hoop and mass A will reduce as the body A is gaining the potential energy.

The Attempt at a Solution

What will cause the hoop to bounce? Think of the force on the mass A and the centripetal force required to keep it rotating when mass A is at its highest point (highest velocity).

AM
 

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