Difference between different kinds of motions of a rigid body

AI Thread Summary
General plane motion involves both translation and rotation of a rigid body, while rotation about a fixed axis is limited to rotation around a single axis without translation. The equations for work and energy may appear similar, but the identification of motion types depends on the motion's constraints and the body's movement. The instantaneous center of a disk in planar motion is typically where it contacts the ground, but this can vary based on the specific motion. To clarify your confusion, providing a detailed description or a scanned image of your example would be beneficial for further assistance.
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?
 
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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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