MadSci Network: Physics
Query:

Re: When, for a scientist, do bumps turn into friction?

Date: Tue Jan 2 23:32:00 2001
Posted By: Tom Cull, Staff, Clinical Sciences MR Division, Marconi Medical Systems
Area of science: Physics
ID: 978302701.Ph
Message:

My best definition are:

bump = sudden redirection of momentum with possible energy loss/transfer. 
friction = loss of energy or ability to do work due to contact forces.

In my opinion, the difference is subjective. A bump is sort of a quantum of 
frictional force.  When you get down to the microscopic surfaces, the 
difference may be a more distinct loss of contact in a bump.

Concepts like slip-stick or inelastic collision will complicate the distinction.

Sincerely,

Tom "Belt Friction" Cull


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