Rambler's Top100





F = ηmg, F =
μN = μ(1 η)mg
μ = η/(1 η).
A =
0
(1η)l
F dl
. l
=(1 η)l, dl
= l · .
A =
η
1
μ(1 η)mgl = μmgl
1
η
(1 η)d(1 η)=
1
2
μmgl(1 η)
2
|
1
η
=
1
2
μmgl(1 η)
2
=
1
2
η(1 η)mgl.
m,
v
1
.
2mv
0
=3mv
1
v
1
=
2
3
v
0
.
2
mv
2
0
2
=3
mv
2
1
2
+ Q + A
,
Q A
Q
(u mv
0
=
2mu,
mv
2
0
2
=2
mu
2
2
+ Q u =
1
2
v
0
,Q =
1
4
mv
2
0
.
0 F = kmg.
A =
1
2
F l =
1
2
kmgl.
v
1
,Q,A l =
v
2
0
6kg
.
ρ = m/L,
x dx dm = ρdx.
α
dF = μgdm S = xα.
dA = dF S = μρgαxdx.
A =
dA = μαρg
L
0
xdx =
1
2
μαρmgL.