Energy Conservation with Friction

1
Energy Conservation with Friction
2
If no friction, PE1 KE1
PE2 KE2
1
2
If friction, PE1 KE1 gt PE2 KE2
PE1 KE1 PE2 KE2 Wfr
Wfr Eth Ffr d
3
Conservation of Energy The total energy of a
system is constant
4
m
1
y1
2
y2
Box slides from point 1 and stops at point 2.
Work lost to friction?
mg(y2 y1)
5
Inclined Plane moving down (with friction)
m
l
µk
?
Box moves down incline and then slides along
horizontal surface. Speed at bottom of
incline? Distance along horizontal for box to
stop?
6
Inclined Plane Moving up (with friction)
µk
v0
?
m
How far up plane does box slide before it stops?