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# Re: rolling

Agreed, but it is not more force, and yet the acceleration increases.
sk

-----Original Message-----
From: Brian Whatcott [mailto:betwys1@SBCGLOBAL.NET]
Sent: Wednesday, February 04, 2004 06:52
To: PHYS-L@lists.nau.edu
Subject: Re: rolling

If you put more work in, (or at a faster rate), you get more
kinetic energy in the barrel.
The force applied at the tangent of the barrel moves faster,
further, than the same force applied through an axial tether.

Brian W

At 04:39 PM 2/3/2004, you wrote:
Speaking of rolling.
Some students and I were working on the problem wherein a rope is wou=
nd around a barrel to pull it forward. The rope pulls the top of the =
barrel as it unwinds. When you calculate the acceleration of the barr=
el, it is greater than would it would be if the rope simply pulled at=
the center of mass. This must imply that the friction force on the b=
arrel pushes it forward, a surprising result to us at least.
Anything wrong with our analysis?
skip

Brian Whatcott Altus OK Eureka!