YA MASS Analysis Questions assembly w Part 3-C 1. How many forces are acting on the meterstick when you have it balanced? Identify each. Fer assen 2. Draw a diagram of the meterstick showing each force vector acting on the meterstick. Place each force in the approximately correct location. Draw and label (CW or CCW) the torque generated by each force. he met ata sh 3. How many torques are acting on the meterstick when it is balanced? Why is the number of torques different from the number of forces you identified in question #1? for Calc sive of the 4. In what direction is each torque acting (clockwise or counter-clockwise)? fi 5. What is the net torque acting on the meterstick when you have it balanced? How do you know this by looking at the meterstick. Part 4-B 6. How did you know where to place the hanger assembly in order to make the meterstick balance? 7. Draw a diagram of the meterstick showing each force vector acting on the meterstick. Place each force in the apprioximately correct location. Draw and label (CW or CCW) the torque generated by each force. Part 5-A 8. Draw a diagram of the meterstick showing each force vector acting on the meterstick. Place each force in the approximately correct location. Draw and label (CW or CCW) the torque generated by each force. Part 5-B Draw a diagram of the meterstick showing each force vector acting on the meterstick. Place each force in the apprioximate correct location. Draw and label (CW or CCW) the torque generated by each force. 12 emas Name Torque Lab ew is Data: Mass first hanger assembly = 4 21,939 -100 mass second hanger assembly = lee, o. gg Meterstick mass Meterstick COM = 4.7m u let 76.65 g Р Clockwise Counter Clockwise P is cem А qa, ogg A 2193 First torque Second Torque R R τ T F. r Ttotal F. T T F r Ttotal T r 3 3 4 4 5a 5a 5b 5b Observations part 2: ssselly fall sssant day fall Torque Lab Part 1 - Finding the Center of Mass – In order to find all the torques on an object, you have to include the torque due to the weight of the object. Depending on the fulcrum placement that you choose the weight of the object may create a torque. Since we consider all of the weight to be acting at the COM we can easily calculate the torque caused by the weight of the object. The first thing we must do is to find the COM of the meter stick. Part 1A – Slide the clamp without the swinging hanger onto the meter stick until it is close to the center. Make sure the set-screw is under of the meter stick and the metric side of the meter stick is facing you. Part 1B - Place the meter stick on the fulcrum and adjust the location of the clamp back and forth until the stick remains relatively horizontal. Tighten the set-screw. Make sure the meter stick remains horizontal after you have tightened the set screw. If not, readjust the meter stick. hanger COM - Part 1-C - Once the meter stick is balanced, record the location of the clamp. This is the COM of your meter stick. You will use this value each time you must use the COM of the meter stick. ockwi Notice that before you had the meter stick balanced, it would swing one way or the other. The weight of the meter stick was acting at a distance “" away from the fulcrum and was creating a net torque on the meter stick. Once you placed the clamp on the COM the weight was directly above the fulcrum and was acting at the pivot point. That means that “p" = 0 and there is no net torque. Part 2 - Single Torque Leave the clamp at the COM and keep the meter stick on the fulcrum. r Part 2 A-While holding the meter stick horizontal, slide a clamp with a swinging hanger onto the meter stick to about the 80 cm mark. Now release the meter stick and observe what happens. Record your observation below. metheus fall Part 2 B - While holding the meter stick horizontal, remove the clamp at 80 cm and place it on the other side at the 20 cm mark. Now release the meter stick and observe what happens. Record your observation on your data sheet. Your set up should look something like the diagram below menee face For each instance above, the clamp added a torque to the system. This caused the meter stick to rotate. One way caused it to rotate clockwise and one caused it to rotate counter-clockwise. When describing a torque, it is customary to describe it as a clockwise torque or a counter-clockwise torque depending on the direction of rotation. lo Part 3 Finding Net Torque - In part 2 there was only one torque created by the clamp. Now we will be dealing with a system that has multiple torques acting on it. J T=Fin T=Fid Part 3 A – Using a balance, find the mass of each hanger assembly which includes the clamp, swinging hanger, and the mass hanger Add too Part 3 B – Hold the meter stick horizontal and place one hanger assembly at the 20 cm mark. Note make sure the set-screw is above the meter stick. Now slide the other hanger assembly onto the opposite side of the meterstick until the meterstick remains horizontal when you let go of the second hanger assembly. Answer questions 1-5 on your data sheet. 77 finan 니 Record the mass and distance of each hanger assembly in section for “Part 3" of the data table. Remember that each distance is measured from the pivot point to the measuring edge of the clamp.Calculate the amount of torque generated by each hanger assemby by multiplying the mass of the assembly times its distance from the pivot point. Part 4 Center of Mass as Torque – for this section you will move the fulcrum away from the COM in order to use the weight of the meterstick as a torque. et aull 77 Part 4 A – Remove all clamps from the meterstick and find the mass of the meterstick on a balance. Part 4 B - Put the clamp without a swinger hanger back on the meterstick. Hand place the clamp at the 60 cm mark. Put the meterstick on the fulcrum. Notice that the meterstick no longer balances with the pivot point at this position. Take one hanger assembly and add 100 g to the assembly. Place this assembly onto the meterstick at the 100 cm mark and slide it towards the fulcrum until the meterstick is balanced. Record the mass and distance of the meterstick and the mass and distance of the hanger assembly in the appropriate section of “Part 4” in your data table. The distance for the meterstick would be from the COM to the pivot point. Answer questions 6 and 7 on your data sheet. 66. 6am Part 5 Multiple Torques on one side - For this section you will have two torques on one side of the pivot point and one torque on the other side. This will show you how the net torque can be calculated using the total torque on each side. 121,9 3 g Part 5 A - Remove the hanger assembly from meterstick. Leave the Fulcrum at the 60 cm mark. Add 200 g to one hanger assembly and place it at the 90 cm mark. Add 100 g to the other hanger assembly and place it on the meterstick at the 0 cm mark. Slide this hanger assembly towards the fulcrum until the meterstick is balanced. Record the mass and distance of the meterstick and the mass and distance of each hanger assembly in the appropriate section of “Part 5" in your data table. The distance for the meterstick would be from the COM to the pivot point. 100g - Anigan Part 5 B - Move the 200 g hanger assembly to the 80 cm mark. Slide the 100 g hanger assembly until the meterstick is balanced again. Record the mass and distance of the meterstick and the mass and distance of each hanger assembly in the appropriate section of “Part 5” in your data table. The distance for the meterstick would be from the COM to the pivot point. Answer question 8 and 9 on your data sheet. . 9