Experiment No 8 COMPOUND PENDULUM II Acceleration due to gravity (g) by using Bar Pendulum II

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Acceleration due to gravity by using Bar Pendulum | Compound Pendulum Experiment | Physics Affairs
AIM: To determine the moment of inertia of fly wheel about its own axis.

EQUIPMENTS REQUIRED:
Flywheel mounted on axle and supported by bearing,
Meter scale,
String,
Vernier Caliper,
Weights,
Stop watch.

THEORY:
Moment of Inertia is the property of the body by virtue of which it resists the change in the state of its angular motion about any axis. It depends upon the mass of the body and the distance with respect to axis of rotation.

The flywheel consists of a heavy circular disc/massive wheel fitted with a strong axle projecting on either side. The axle is mounted on ball bearings on two fixed supports. There is a small peg on the axle. One end of a cord is loosely looped around the peg and its other end carries the weight-hanger.

PROCEDURE:
1. Attach a long thread about 1.8 m length to the axle of flywheel and end of thread is attached to the axle while the pan is attached to the outer end of the thread.
2. Weight should be added so that pan must be in suitable line on the wheel by which we can calculate number of revolutions of the wheel.
3. Wrap the thread on the axle and measure the height of the pan from the ground level, and then add the weights in the pan and take readings of time required for pan to touch the ground.
4. This time is calculated by using the stop watch as soon as weight starts moving down.
5. The length of the cord is carefully adjusted, so that when the weight-hanger just touches the ground, the loop slips off the peg.

A suitable weight is placed in the weight hanger. A chalk mark is made on the rim so that it is against the pointer when the weight hanger just touches the ground.

7. The other end of the cord is loosely looped around the peg keeping the weight hanger just touching the ground. The flywheel is given a suitable number (n) of rotation so that the cord is wound round the axle without overlapping.
SAMPLE CALCULATION:

Moment of inertia (I) in g-cm2 :-

For first set of reading I1 = m g r n1 t2
4ᴨ n2(n1+n2)

I1 = 150 x 981x1.06 x 9 x 17.912
4ᴨ x 10.02 (9+10.02)

I1 = 188.023 x 103 gm-cm2
AIM: To determine the value of acceleration due to gravity “g” with the help of the bar pendulum or compound pendulum.

EQUIPMENTS REQUIRED:
Steel bar with holes in it for suspension (bar pendulum),
A knife edged fulcrum,
Stop watch,
Meter scale