To determine moment of inertia of fly wheel by falling method
Apparatus
A
heavy flywheel mounted on an axle on suitable bearings ,A ruler,
Vernier caliper, Different masses
Thin cord ,Stopwatch
Procedure:
1. Radius of axle of fly wheel & mass of pan were
recorded.
2. A cord with length
equal to ten times diameter of axle was taken
3. A loose loop was formed at one end and a pan was attached
at the other end. A pin was attached to
the loose loop. Pin was inserted
in the hole
of axle &
fly wheel was turned slowly so that the cord was wound around the axle for n1 turns (say 3). n1 was recorded.
4. A short horizontal
line was marked
on the outer
surface of fly
wheel, when pin
was horizontal.
5. Some mass (say 50 gm) was pl aced in the pan & mass
'm' in kg (inclusive of mass of pan) was recorded.
6. The mass was released & stopwatch was started at that
instant.
7. Stopwatch was stopped
at the instant,
when falling mass
was detached from
fl y wheel . No of rotations
n2 which flywheel
make after detachment
of mass &
till fl y wheel stopped was
counted. Thus t and n2 was recorded.
8. Steps (iv) -(vi i) were
repeated with different values of
n1 and m.
Observation and calculations
Radius of axle
=--------------------------------m
|
Sr
No
|
No
of turns of cords on axle
(n1)
|
Mass
in (Kg)
|
Time
for detachment
t(sec)
|
No
of revolution after detachement(n2)
|
I
(Kg-m2)
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Sample calculations for one
reading: ………………………………………………………….
Average I =……………………………………………………………………….Kg-m2
ANALYSIS AND
CONCLUSIONS
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