Figure 4.

 

 

Figure 4, shows set up of equipment, but does not show the forces acting on this bar.

Figure 5.

 

 

 

Figure 5, which is above, is shows Free Body Diagram of this bar. Tension force of the string did not shown, because system already in equilibrium.

Where, is the mass of the bar, is distance between string and the beginning of the bar, is a distance between string and , is a distance between string and and is a distance between centre of mass of the bar and the beginning of the bar.

 

Part B1 (Experiment 1.2 with the 1^st irregular shaped bar)

As in the Object 1, before using formula (2), experiment should be done two times. In the second experiment bar was hanged in different point. Masses also were hanged to other points. Therefore, all system must be in equilibrium. Figure 6, below, will give visual information about, how bar and masses were hanged.

Figure 6.

 

 

How can be clearly seen in the Figure 6, the masses are in different place. Then, to get more information and show where the forces acting to the bar, will be done Free Body Diagram. Figure 7, above, is the free body diagram, which show all forces acting on the bar.

Figure 7.

 

Where, is the mass of the bar, is distance between string and the beginning of the bar, is a distance between string and , is a distance between string and and is a distance between centre of mass of the bar and the beginning of the bar.

Part C1 (Raw data and calculating)

During the Experiment 1.1 and Experiment 1.2, were recording data. Data are sorted in the Table 3 for the length and Table 4 for masses.