Difference between different kinds of motions of a rigid body

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SUMMARY

The discussion centers on the distinction between general plane motion and rotation about a fixed axis in rigid body dynamics. Both types of motion utilize similar work and energy equations, but they differ in their application and identification. The instantaneous center of a disk undergoing planar motion is not always at the point of contact with the ground, which can lead to confusion in specific examples. Clarification on these concepts is essential for accurate analysis in mechanics.

PREREQUISITES
  • Understanding of rigid body dynamics
  • Familiarity with work and energy principles in physics
  • Knowledge of planar motion and rotational motion
  • Ability to analyze motion using instantaneous centers
NEXT STEPS
  • Study the equations governing general plane motion and fixed-axis rotation
  • Learn about instantaneous centers and their role in analyzing motion
  • Review examples of rigid body motion in physics textbooks
  • Explore simulation tools for visualizing rigid body dynamics
USEFUL FOR

Students of physics, mechanical engineers, and anyone studying rigid body dynamics will benefit from this discussion, particularly those seeking clarity on motion types and their applications.

avleen
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Hi
i want to know what the difference between general plane motion and rotation about fixed axis is?

im using their formulas for work and energy study and as far as i see their general equations are the same.

how do i identify which is which.

also in a disk with planar motion, is the instantaneous centre ALWAYS where the disk touches the ground?
please help!i have a specific example which is confusing me but it is an example in my book i don't know how to bring it up online so you guys can help me??
any suggestions?
 
Last edited:
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avleen said:
i have a specific example which is confusing me but it is an example in my book i don't know how to bring it up online so you guys can help me??
any suggestions?
Maybe you can scan it and upload it. Or just describe it carefully.
 
Doc Al said:
Maybe you can scan it and upload it. Or just describe it carefully.
i will do that. but would you be able to explain the difference between the two motions?
 

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