Angular momentum

1
Angular momentum
2
t rFsinq (the twisting force)
q
3
Cliff and Will
4
tcw tccw
5
Sample problem
The rock has mass of 1 kg. Find the mass of the
meter stick.
6
Rotational version of Newtons 2nd Law
Linear Motion (of CM)
Rotational Motion (about CM)
?
Fnet m aCM
tnet m a
7
New Olympic EventRotating Rods
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Rotational version of Newtons 2nd Law
Linear Motion (of CM)
Rotational Motion (about CM)
Fnet m aCM
tnet m a
tnet I a
Moment of inertia
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Rotational version of conservation of momentum
Linear Motion (of CM)
Rotational Motion (about CM)
if text 0 then Li Lf
if Fext 0 then pi pf
linear momentum
angular momentum
L Iw
p mv
10
L is conserved, but w is not
Li Lf
Iiwi Ifwf