Copy of FIRSTLAST1_FIRSTLAST2_PHYS182A_195L-LAB5_student.docx

PHYSICS 182A/195L LAB REPORT - LAB 5: NEWTON’S SECOND LAW So that we can write: . Finally, the acceleration of all masses can be solved for by dividing the above equation by the total mass : . Procedure Setup 1. Measure and record the masses of the Smart Cart (scale should be located at the front of the lab). Record the value in SI units in Table 1 and the first row of Table 2 below. 2. Check that the PASCO Universal Interface is turned on and connect the Smart Cart via the Hardware Setup tab (left side of the screen). 3. Level the track with the Torpedo Level. Once the track is level, the Smart Cart should not move in either direction when placed on the track. 4. Check that a gate with elastic band (shown in Figure 2) or a magnetic End-Stop is located on the end of the track between the Smart Cart and the pulley. We do not want the Smart Cart to hit the pulley or fall off the track. 5. Check that the Common Rate is set to 40.00 Hz (located at the bottom of the screen next to Recording Conditions .) 6. Drag over 3 graphs, one for each of the parts below. They should be set to track velocity. 7. Tie a loop in both ends of a braided physics string. Loop one end on the Smart Cart hook, pass the string under the elastic band (or through the End-Stop hole), and hang a mass hanger on the string over the pulley. 8. Make sure that the string is parallel with the track from the Smart Cart hook to the pulley (i.e. the pulley and hook should be at the same height). The string should not touch any other part of the setup between the hook and the pulley. Part A 1. Place 0.040 kg in the Smart Cart in order to set kg. 2. The mass hanger weighs 0.005 kg. Add a 0.015 kg mass from the Mass and Hanger set for a total hanging mass of 0.020 kg. 3. Pull the Smart Cart back as far as possible without allowing the mass hanger to touch the pulley. Allow the pulley to come to rest (we do not want it to be swinging wildly when recording data). 4. Start Recording and release the Smart Cart. 5. Click Stop after the Smart Cart strikes the elastic band (or End-Stop). 6. Click on the Data Summary button (left Toolbar). Right click on the run you just made and rename the data ‘Part A’. 7. Use the data selection tool (yellow pen icon) to select only the linear portion of your data. 3 Department of Physics

3. What happened to the acceleration going from Part A to Part B? It increased Part B Plot B: Copy your velocity graph for part B into the box below. 4. What happened to the force going from Part B to part C? Stay the same 5. What happened to the total mass going from Part B to Part C? It doubled