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Re: work done by friction

At 7:41 AM -0700 10/25/99, Leigh Palmer wrote:
If one looks at a particular transformation a system undergoes and asks
"What are the initial and final energies of A and B?" instead of
"How much work does A do on B?", is the question of what to name
the agent of change operating in the system really physical? I
can't think of a situation in which knowing how to classify such
a process really matters.


Would you expect your students to draw a FBD? And, if so, would you
expect the force of the conveyer belt on the box to NOT be
designated as a 'friction' force?

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