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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In most of this practical, the lengths x and y are to be equal, contrary to what is indicated in the figure. The general approach for calculating the moment inertia of any type of body about any axis on the body is given experkment Remember to include error bars in this plot.

Solutions for HW Radius of each added mass. Analysis of changes in the Period of a Pendulum. Preparation The international system of units is known as SI units, and is based on the seven units listed in Table 1. It is important that the oscillations are about the vertical axis; setting the pendulum in another mode of oscillation will lead to incorrect results. Suwpension length L was further adjusted and the time taken for another 20 oscillations was recorded.

You will set up an equation giving the period of oscillation of a complex pendulum, using dimensional analysis to ensure that the equation is dimensionally correct. It can be difficult to find out specifically about bifilar pendulums, but there is information available on the worldwide web.

To this effect, it would be useful to draw up suitable tables before you start collecting data. Schematic of a bifilar pendulum. The seven base units of the SI system.

Do your measurements support your deduction that the period of oscillation is independent of mass? You now should check this experimentally. Skills Sessions The Bifilar Pendulum 4. Where Io is the moment of inertia of the bored holes. The Bifilar Pendulum – durham physics laboratory guide. The bar must be suspended symmetrically in a expetiment position by two threads of equal length.


In addition an enclosed-type measuring tape and weight balance were also used for the experiment.

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Distance between the wires, b. The apparatus used for this experiment consists of a uniform rectangular drop bar suspended by fine wires assumed to have negligible weight contribution to the system.

However, physical quantities suspensioh different dimensions cannot be added to one another for instance, it does not make any sense to add a temperature to a length.

You experriment take enough readings to reach a definite conclusion about the values of the unknown powers, which you can assume to be simple fractions. In Task 3 you showed that the period of oscillation should be independent of the mass of the bar. The rectangular bar was then detached from the apparatus arrangement and taken to weight balance in order to determine the mass of the bar.

From this, the periodic time was also calculated. Add a trend line and stick the graph in your lab book. For each set of parameters x, z, l, m you should take a minimum of four measurements of the period and calculate the mean, the standard deviation and the standard error. Consider the equation that describes a simple pendulum. These readings encompasses the distance between the wires used for the suspension, the length of the wires, the time for the required number of oscillations, the distance between the masses introduced into the experiment, and so on.

Now determine the powers of z and x, i.

practical physics: experiment BIFILAR SUSPENSION

What are the physical dimensions of the left hand side of Equation 1? To what magnitude of angle should you limit the swings? Check your conclusions by dimensional analysis.

In this situation the length of the wires are kept constant and the distances between the two equal masses are varied.


As noted above, for most of this investigation we will consider the simplified bivilar where x suspensiob y are equal and the suspension filaments are vertical. Starting from Equation 1express the logarithm of T in terms of the logarithms of A, z, x, m and t. The periodic time significantly increased when the length of the wires also go increased.

The periodic time also increased when the distances between the masses added to system reduced. Thickness of the bar. Length of bar l.

Chucks are also in place to alter length of suspended wires. This is done by suspending two parallel cords of equal length through the object examined. The length of the wire L was then fixed at a value and the time taken was recorded for 20 oscillations at varying distances xbetween the two 1. Period of a pendulum. Ready to Start A bifilar suspension pendulum is one in which two bi filaments filar support a rod.

Bifilar suspension

Biilar of the bar m. The bifilar suspension technique offers the opportunity to determine the radius of gyration of a body by relating the readings gotten from the procedure in the techniques and relating that into the equation of angular and this invariably provides the determination suspenzion the moment of inertia for the same body.

To determine the moment of inertia of a horizontal rectangular drop bar about its center of mass using the bifilar suspension technique. You will then determine experimentally the relevant exponents in the proposed equation, taking multiple, repeated measurements and doing a statistical analysis of the data.

What is the relation that now exists between the powers a, b, and e to balance dimensions after introducing the dimension of time to euspension correct power?