Three physical quantities need to be measured in this experiment – Mass, Length and time (period). Make the following table –
| Sl No. | Physical Quantity | Measured With | Least Count |
|---|
| 1 | Mass | | |
| 2 | Length | | |
| 3 | Time | | |
- Measure the mass of the object.
- Carefully tie strings symmetrically on either side of the object. Hang the object to the stand such that it is about 5-10 cm above the table. Secure the stand firmly to the table.
- Measure the distance between the two points at the suspension. This is 2d1.Measure the distance between the lower ends of the strings. This is 2d2.
- Twist the strings through a small angle. The object will execute periodic motion about the axis perpendicular to the CM. Measure the time taken for 10/20 oscillations. Repeat this measurement for five times.
- Repeat the measurement for the same axis with different lengths of the string and different points of suspension at the object (2d2).
- Repeat the steps 2-4 for other two axes.
How to measure time period:
- After starting the oscillation, wait for about five oscillations before staring the measurement of time for 10/20 oscillations.
- Also make sure that the amplitude of the oscillation does not reduce during the measurement.
- Mark a vertical line (or use sharp edge of the object) as a reference and count using a pointer.
Mass of the object: _____Kg
| Sl. No. |
Position of pendulum |
h (m) |
d1 (cm) |
d2 (cm) |
Time for 20 oscillations (s) |
Time Period (s) |
Moment of inertia (Kg.m2) |
| 1 | Flat | | | | | | |
| 2 | Horizontal | | | | | | |
| 3 | Vertical | | | | | | |