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] |
William Beaty wrote:
We agree that work is done in speeding up an object.
It's wrong to say that work is done in slowing that object down?
In what frame of reference? If a block comes to rest relative to my desk,
I can pick a frame of reference in which the block is speeding up. For
example, the desk is in a truck that has just accelerated up to cruising speed,
and I choose the ground as my rest frame. In this case the block speeds up and
ths it's K.E. increases.