An erect pencil on a frictionless plane

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    Frictionless Plane
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SUMMARY

The discussion focuses on the dynamics of a pencil modeled as a uniform rod, released from a vertical position (θ = π/2) on a frictionless plane. Participants explore the application of classical mechanics principles, specifically conservation of energy, to determine the velocity of the pencil's end (point A) upon striking the table. The conversation highlights the challenges in applying conservation of momentum in this scenario, emphasizing the need to consider non-conservative forces and work done during the pencil's fall.

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Homework Statement



A pencil is released from rest with θ = pi/2 and topples over. Treat the pencil as a uniform rod and find the velocity of the end A when it strikes the table if the table is frictionless.

Homework Equations



Classical Mechanics

The Attempt at a Solution



conservation of energy? not sure
conservation of momentum? doesn't seem to work
 
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zheng89120 said:

Homework Equations



Classical Mechanics

What part of Classical Mechanics do you think of?

zheng89120 said:

The Attempt at a Solution



conservation of energy? not sure

Is there any force which does work and is not conservative?

ehild
 

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