To determine the moment of inertia of fly wheel by falling weight method.

Aim

To determine the moment of inertia of fly wheel by falling weight method.

Theory:

Flywheel is a device which absorb energy when demand is Less than the supply of energy ans will give out the energy when demand is more than the energy being supplied. It consists of a heavy wheel mounted on the axle and the axle is supported on small bearing.

Let N1 be the number of revolutions made by flywheel while the mass m is falling by height ‘h’ and N2 be the number of revolutions made by the flywheel before coming to rest. Let ’t’ be the time taken to complete the revolution N2 ,r be the radius of flywheel ,then the moment of inertia of flywheel

The aim of the experiment is to find support reaction of a given truss (in the present case it is warren type) and verify analytically considering it simply supported. The truss is loaded at three joints and supported on a frame through spring balances at two joints. The readings on the spring balance show the amount of force on the support.

Apparatus Used:

1. Flywheel.
2. Hanger with known masses
3. Weight
4. Stop watch
5. String
6. Vernier calipers.

Procedure:

1. Measure the radius of the axle by vernier caliper.
2. Attach the string & wind it and push the pin of string into the hole of axle &count the number of turns.
3. Attach the mass to the outer end of string and measure distance between floor and weight.
4. Release the mass. As mass falls, the wheel makes revolutions. Note the time of the fall from instant of release to the instant it gets detached.
5. Start stop watch as mass is detached and observe the time taken to come to rest. Also note the revolutions of flywheel after detachment of mass, Count the total number of revolutions made from the instant the mass is released to the instant it comes to rest.
6. The steps as mentioned above are repeated and an average are taken.
7. Repeat the procedure for different weights.

Observations and Calculations:

Radius of flywheel axle (r) =……….cm

Result:Observed moment of inertia of flywheel is …………………..

Precautions:

1. Measure the lengths accurately.
2. Note down the time accurately.
3. Revolve the fly wheel without jerk.

Viva Questions:

1.What is a fly wheel?

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Q.-2. Define plane Moment of Inertia?

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Q.-3.Differentiate between inertia and moment of inertia?

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Q.-4.Define radius of gyration?

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Q.-5. Explain parallel axis theorem and perpendicular axis theorem?

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Q.-6. 6. Define product of Inertia and principal Moment of Inertia?

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