Chronology Current Month Current Thread Current Date
[Year List] [Month List (current year)] [Date Index] [Thread Index] [Thread Prev] [Thread Next] [Date Prev] [Date Next]

Re: work done by friction

Let's make sure that we are only analyzing the horizontal motion of
the bos AS it is dropped onto the belt.

The box originally has zero horizontal momentum. At a later time, it
has gained a certain momentum p. I am currently claiming to my HS
students that this delta p arises from something we call a force
acting for a time interval delta t. This is in fact our first
DEFINITION of force in our new revised 'Momentum First (tm)'
curriculum.

Please tell us what we are doing wrong (before we kill AGAIN!)



At 5:20 PM +1000 10/26/99, Brian McInnes wrote:

Let's take Chuck's example first. The box has fallen on to the belt
and after it makes contact with the belt there is surely no relative
motion between it and the belt.

-. .-. .-. .-. .-. .-. .-. .-. .-. .-
\ / \ / \ N / \ C / \ S / \ S / \ M / \ / \ /
`-' `-' `-' `-' `-' `-' `-' `-' `-'
Chuck Britton Education is what is left when
britton@odie.ncssm.edu you have forgotten everything
North Carolina School of Science & Math you learned in school.
(919) 286-3366 x224 Albert Einstein, 1936