PHY 251 Lab 10 - Torque and Rotational Equilibrium Materials - Pencil Metric ruler* Coins (orhadhash pennies....) "This doesn't have to be a ruili, it can be anything that you can make o set-saw out of- One chonge would be to use a board or mites sock Isaimed of = 12 in muli. 1. Determining the center of mass. . Method - make a series with the pencil and the ruler. 1 cr . Find the center of mass of the ruler. CM cm If you on using a 50 cm ruler this wil probably be around 15 ant. Mecause It prechainly though. Poor beforee & sow in equilibrium From now on we will call me CM our pivot point. * Your balance is now in equilibrium! From now on we will call this our pivot point. 2. Balancing with different masses. Place 2 pennies at a pielanes of 19 cm from the pivot on both sides. If properly callbrated your balance should be level. This is just a test. Mass of a penny, 5 - 2.5gPlace 6 pennies at 10 om (x.) where do you have to place 3 pennies in order to balance? x) =_ cm Position from Dom, k Torque arm d (cm) Torque [Nm] (om) - 10 di . Calculate the percent difference between the torque values. 46 difference - X 10046 . Place 4 pennies at & cm. How many pennies do you have to place at 25 cm In order to balance? Position from Dom, k Torque arm d (cm) Torque [Nm) (cm) - 25 di . Calculate the percent difference between the torque values. 3. How much does a nickel weigh? . Balance 4 pennies on one side with 2 nickels on the other. Use the sum of the torques to estimate the mass of a nickel in grams.Show your calculation. Mass of a penny, CA- 2.5 g " With the some 4 pennies and 2 nickels, change their locations and do two Trial 1 Trial Trial 3 ITE The true mass of a nickel is 5 g- Calculate the percentage error. Show your work. Exp - Accl x 1004 Acc 4. Determining the mass of the ruler . Place the pluot at 10 om [Le. not in the center anymore). Now the balance isn't balanced. * Place pennies (how many?) somewhere on the short side in coast to balance.Number of pennies Position of the pennies from a cm . Use this to estimate the mass of the ruler. * Draw the free body diagram of the balanced system, Indicating the forces and distances from the new phot point. . Show your work for determining the mass of the ruler. Discuss the errors associated with this experiment and how significant they were. Give ways this experiment could be improved