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: MOMENT OF INERTIA

I am not sure what physical situation is referred to here. My previous
message had to do with a book on a table, no acceleration.

Friction can NEVER cause an increase in speed. Static friction only
opposes outside forces and there is no motion at all (static). Once
static friction is overcome (by some other outside force) and the body
starts to move, friction is always opposite to velocity and slows the
body down.
J. Epstein

If the contact force is a vertical force (and I agree that it is), then it
cannot cause an acceleration in the horizontal direction. The only force
in the horizontal direction is the friction force. Therefore, it is
responsible for the horizontal acceleration.