S: Gabriela Romero & Elias Bardales
BC: By: | Gabriela Romero | Elias Bardales
FC: Balanced | And | Unbalanced | Forces
1: Introduction | In this Lab Report we going to Learn how Balanced and Unbalanced works!!
2: Objectives | Vector addition can be demonstrated by measuring the effect of forces on each other using a device called force table. | 1. practice vector addiction using components. 2. observe the relationship between the resultant and the equilibrant. 3. gain experience using a simple force table. 4. determine the weight exerted by known mass.
3: Required Equipment | 1. Balance. 2. force table and accessories. 3. metric mass set string, heavy. | Substitution Equipment | 1. force board. 2. kitchen of postal scale. 3. metal washers. 4. paper clips.
4: Procedure | setup | 1. If you are using a simple force board rather than a free- standing force table, support it with books so that the masses can hang freely. 2. Fasten three strings to the ring by tying a small loop in each string as show in figure 2. 3. Place the ring with is three strings over the force table's center peg. 4. Thread the loose ends of the string over the pulleys. tie a loop at the end of each string.
5: Trial 1 | 1. Attach the masses to the three strings. 2. Attach 200g. to the free ends of both string 1 and 2 and 350g. to string 3. 3. Arrange the pulleys so that string 1 is positioned directly over the 0 degrees mark and string 2 over 55 degrees. move the third pulley to the left of the right until the ring in the center is exactly centered over the peg. you may need to add more mass to string 3 but don't add additional mass to string 1 and 2 or change their positions. 4. Estimate the angular position of string 3 to the nearest tenth degree and record the measurement under direction of F3 in table 1. 5. Record in table 1 the magnitude of the force (in newtons) on each of the three strings.
6: Trial 2 | 1. Replaced the mass string 1 with a mass of 150. Keep the pulley at 0 degrees. Add 50g, to the 200g. mass on string 2 and move it to 65 degrees. 2. Move the pulley containing string 3 to the left or right and add additional mass to the string as necessary until the ring is centered over the peg. 3. Record in table 1 the magnitude of the force for each string and the direction of the third string.
7: 2.45N | Data
8: Post Lab Exercises | 1. Using trigonometric formulas, calculate the equilibrant of F1 and F2 for trials 1 and 2. use the information in table 1 to draw the vectors and find the resultant ( the sum of the forces). From the resultant you should be able to determine the equilibrant. Show your work in the space allotted for solutions. Record the percentages in table 2. 2. Determine the percent differences between your measures and calculated values for the equilibrants. Record the percentages in table 2. 3. Recall that percent difference = difference of the two values * 100% average of the two values
9: Table 2
10: Trial 1 Calculations
11: Trial 2 Calculations