made a mistake when I wrote Ef = Kf + Ugf
instead it's -->
Ef = Kf + Ugf + Usf
where Kf is = 0
No it does not make sense.
Workdone by gravity= force down plane*distance= mg*sinTheta*x
Work done on spring: 1/2 k x^2
Work done on friction: mg*cosTheta*mu*x
divide by x, then group terms
x=98/125 *.7*.7= .392m
check my thinking.
ohhh I see now, but when you say Work done on spring, you take the Energy formula which is 1/2 k x^2 , wouldn't the work on a spring be mu*N*x?
and why isn't it Wg = Wspring - Wfriction
as friction is going to other way?
nevermind my first question, my mistake hehe
your second quesion. Friction absorbs energy, as does the spring. They add to equal the energy input of the system.
okay cool, thanks a lot Bob
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