Lab 120 – Conservation of Angular Momentum
11/22/06
Group 1:
Russell Adams
Pawel Bokota
Vahid Hamidullah
Mike Makhlouf
Physics 111A
TA: Ke Su (
[email protected]
)
1.  Objective
To demonstrate that angular momentum is conserved in inelastic collisions.
2. – Theory
The angular momentum of a mass
m
with velocity
v
about an axis AA’ is given by:
L
m
= pd = mvd
where
d
is the
perpendicular
distance from the axis to the
line of action
of the vector
mv
. The
angular momentum
L
of a body with a rotational inertia
I
rotating
with an angular velocity
ώ
about axis AA’ is given by:
L
AA’
= Iώ
After the ball rolls down the ramp it is caught in the ballcatch in an inelastic collision. When the
ball is caught in a ballcatch, the ball, ballcatch, small pulley disk and large aluminum disk rotate
about the central axis. You are to prove that the total angular momentum
L
of the system is
constant and doesn’t change when a collision occurs inside the system.
The ball catch is secured to the aluminum disk, and the final angular momentum is that of a ball
catch, the ball, small pulley disk and large aluminum disk.
3. – Equipment
The apparatus of the experiment is illustrated as follows.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
4.  Procedure
1. The mass of the ball, ball catch, top disk and pulley were massed and recorded.
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '10
 Universal
 Physics, Angular Momentum, Momentum, Rotation, ball, aluminum disk

Click to edit the document details