PDA

View Full Version : Forces question


physicshard22
Dec9-09, 10:34 PM
1. The problem statement, all variables and given/known data
A boy puts a 250kg elephant on a piece of carpeting and slides it across the floor by exerting a horizontal force of 425N on the elephant



2. Relevant equations
Ff = uKFn


3. The attempt at a solution
Fn = Fg
Fnet = Fap - Ff
Fnet = 425 - Ff
ma = 425 - uKFn
250a = 425 - uK(2450)

itr
Dec9-09, 10:37 PM
what is the question asking?

physicshard22
Dec9-09, 10:37 PM
for coefficient of kinetic friction

itr
Dec9-09, 10:53 PM
mue=f max/fn
425N/(250x9.81)
mue=.173

I believe thats how you do it

physicshard22
Dec10-09, 03:58 PM
why is friction 425N

itr
Dec10-09, 10:33 PM
its force