AP Physics 1‎ > ‎Unit 1‎ > ‎

Pulley Lab

Pulley Lab

Purpose:

In this activity you will be looking at how the configuration of the pulleys affect the amount of force needed to lift a mass at a slow steady speed.

Information:

Feature of Logger Pro you need to use:


  • Set Data Collection Options allows you to set the length of time you will collect data and the number of samples you will collect per second.

  • Zero:  Set the reading on your probe to zero.  This should be done right before you attach something to the probe.

  • Collect Data:  Starts the data collection.  The data collection will stop automatically at the end of the time you specified in the data collection options.

Part 1: Number of Pulleys (Simulated Part)

  1. Open the program found here in a new tab. 

  2. Before you actually start collecting data, set up a data table that has one column for # of Pulleys and one column for Force (N)

  3. Hit the begin button and then click on the force probe to determine the force being used to lift the mass.  Record the number of pulleys and the force.

  4. Change the number of pulleys to each of the other options and record the force for each.

  5. Open Logger Pro and make a graph of Force vs. # of Pulleys.  Don't actually try to curve fit the data, but make sure to give a comment about what you notice about the results.

Part 2: Number of Pulleys (Live Part)

  1. Use ropes and pulleys to recreate the setups that you saw in part 1.

  2. Hook the Force probe to channel one of your  data collection box.

  3. Set your data collection to run for 2o seconds and collect data at a rate of 500 samples per second.

  4. Hold the force probe vertical in the orientation you will be  using for your six pulley trial and then click on the zero button to set the force reading to zero.  Make sure that nothing is attached to the probe at this time.

  5. Now attach the probe to the string and begin to lift the mass at a slow steady speed.  Start collecting data and allow the data collection to stop naturally.  You don't need to click on the stop button to stop it.

  6. Highlight a nice steady region and then go to the "Analyze" menu and pick "Statistics".  The mean value will be the average force needed to lift the mass.  This is what you want to record.

  7. Repeat this procedure with each of the six set ups that were shown in part 1.  Make sure you create a table and graph for this data.

Part 3: Lifted Mass (Simulated Part)

  1. Once again, open the program found here in a new tab. 

  2. Before you actually start collecting data, set up a data table that has one column for mass and one column for Force (N)

  3. Hit the begin button and then click on the force probe to determine the force being used to lift the mass.  Record the mass and the force.

  4. Change the mass you are lifting and record the force for each of the ten possible masses.

  5. Open Logger Pro and make a graph of force vs. mass.  Curve fit the graph.
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