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

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

Date: Sun Dec 31 17:45:01 2000
Posted by John
Grade level: teacher/prof School: No school entered.
City: Plymouth State/Province: No state entered. Country: UK
Area of science: Physics
ID: 978302701.Ph

Message:


If I rub my hands hotly, that is friction.  If my car judders along over 
rocks, that is bumping.  When do bumps stop and friction start?

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

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