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Theory:

Circular motion is performed by whirling thr rubber bung.

Since the bung is moving in a circular path has non-zero acceleration

directed towards the center of the circle .

According to Newton's second law,F=ma ,directed towards the center

of the circle in order to produce the acceleraion.This is known as the

centripetal force.



Source of errors:

1.There is a frictional force between the string and the rubber tube,

so tension may vary throughout experiment.

2.Human errors in taking measurements.

3.Scale uncertainty of meter rule and table-balance.

4.Faults in the instruments.

5.The circular path of the bung may not be horizontal.

6.The angular velocity of the bung may not be uniform.


Impprovements:

1.Use smooth rubber tube and string to minimize the friction.

2.Use a heavy but small bung instead of light and large onces.

3.Use instruments which are more precise .

4.Repeat the experiment so as to minimize the radom errors.