Procedure: Suspend the rectangular block or (bifilar pendulum) from plane (a b) by . The experiment is repeated for various loads and the corresponding time. Skills Sessions The Bifilar Pendulum The Bifilar Pendulum Preparatory Task: Read the entire script; familiarise yourself with the objectives of this experiment and. View EXPERIMENT 7 from PHY at University of Zambia. EXPERIMENT 7 DETERMINATION OF MOMENT OF INERTIA USING THE BIFILAR SUSPENSION.

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Equation 4 aforementioned above can be modified to: However, Introduction of the two equal masses into the bifilar suspension system can gives rise to a modification of its mechanism and the equation of the angular motion.

Sunday, 26 June experiment Radius of each added mass. However, physical quantities with different dimensions cannot be added to one another for instance, it does not make any sense to add a temperature to a length.

Pressure is a force F per unit area A. The experiment is done such that the oscillation was not dampened by carefully tilting the bar before release for oscillations.

The seven base units of the SI system. Preparation The international system of units is known as SI units, and is based on the seven units listed in Table 1. Moment of inertia values. Where Io is the moment of inertia of the expetiment holes.

Documents Flashcards Grammar checker. Note the there are 15 holes bored, hence its introduction in equation 8.

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Mass of the bar m. Although we have now found all the exponents, we cannot yet accurately describe the period of the pendulum since we still do not know the dimensionless constant A.


Once again, remember to show the errors bars on your graph. You must take enough readings to reach a definite conclusion about the values of the unknown powers, which you can assume to be simple fractions. Then step 3 was repeated but with different values of L.

In addition, the moment of inertia can be further determined by graphical representation from data collated in the experiment. What other physical quantity would it be reasonable to introduce on the right hand side so that the dimension of time is involved. All measurements and data recorded were collated for experimental analysis. However, one can say something about this dependence from dimensional analysis.

The bifialr time significantly increased when the length of the wires also go bifolar.

practical physics: experiment BIFILAR SUSPENSION

Posted by JohnWell Academy at Estimate the error on your determination experiiment A. Measure the period of oscillation of the two long rods made of different materials experimentt NOT change any other parameters. The general approach for calculating the moment inertia of any type of body about any axis on the body is given as: The Bifilar Pendulum – durham physics laboratory guide.

After recording your data, use an Excel spreadsheet to calculate the mean, the standard deviation and the standard error on the mean for the period of oscillation, for each length of the bar. The equation of the angular motion is: Exploration If you have reached this point before the end of the lab session then you could usefully consider suspensoon case when the suspension filaments are no longer vertical.


In Task 3 you showed that the period of oscillation should be independent of the mass of the bar.

The Bifilar Pendulum

The moment of inertia determined using the analytical approach was approximately equal to the value determined from test 2 in table 2 above. Where Mo is the mass of the hole bored, Ro is the radius of each hole bored and X is the distance from each hole on either side to the centre of the rectangular bar. For a solid object with a rectangular cross-section, the same general approach gave rise to determination of the moment of inertia about its centre of mass G and this is expressed as.

The radius of gyration and moment of inertia reduced after the length of wire was increased from test 1 to test 2 but increased right after till test 4. In most of this practical, the lengths x and y are to be equal, contrary to what is indicated in the figure. Below is a tabular representation of the final value of the moment of inertia determined from the analytical approach, the graphical approach and a selected value of the moment of inertia from test 2 in table 2.

Analysis of changes in the Period of a Pendulum.