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lab05proc - PHYS 15200 Mechanics IUPUI Physics Department...

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PHYS 15200 Mechanics IUPUI Physics Department Lab05: Work and Energy Page 1 of 5 Lab 05: Work and Energy OBJECTIVE In this experiment you will be verifying the relationship between the work done by a conservative force on an object and the change in its total mechanical energy. This experiment is adapted from Vernier Physics with Computers experiments using Logger Pro . EQUIPMENT computer masses (200 g and 500 g) Vernier computer interface spring with a low spring constant ( 10 N/m) Logger Pro masking tape Vernier Motion Detector wire basket (to protect Motion Detector) Vernier Force Sensor rubber band dynamics cart PROCEDURE PART I – WORK WHEN THE FORCE IS CONSTANT In this part you will measure the work needed to lift an object straight upward at constant speed. The force you apply will balance the weight of the object, and so is constant. The work can be calculated using the displacement and the average force, and also by finding the area under the force vs. position graph. 1. Connect the Motion Detector to DIG/SONIC 1 of the interface. Connect the Vernier Force Sensor to Channel 1 of the interface. Set the range switch to 10 N. 2. Open the file “18a Work and Energy” from the Physics with Computers folder. Three graphs will appear on the screen: position vs. time, force vs. time, and force vs. position. Data will be collected for 5 s. 3. You may choose to calibrate the Force Sensor, or you can skip this step. a. Choose Calibrate CH1: Dual Range Force from the Experiment menu. Click . b. Remove all force from the Force Sensor. Enter a 0 (zero) in the Value 1 field. Hold the sensor vertically with the hook downward and wait for the reading shown for Reading 1 to stabilize. Click . This defines the zero force condition. c. Hang the 500 g mass from the Force Sensor. This applies a force of 4.9 N. Enter 4.9 in the Value 2 field, and after the reading shown for Reading 2 is stable, click . Click to close the calibration dialog. 4. Hold the Force Sensor with the hook pointing downward, but with no mass hanging from it. Click , select only the Force Sensor from the list, and click to set the Force Sensor to zero.
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PHYS 15200 Mechanics IUPUI Physics Department Lab05: Work and Energy Page 2 of 5 5. Measure the mass of a “200-g” standard weight. Record its value then hang it from the Force Sensor.
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