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lab 7 report

# lab 7 report - Impulse and Momentum The impulse-momentum...

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Impulse and Momentum The impulse-momentum theorem relates impulse, the average force applied to an object times the length of time the force is applied, and the change in momentum of the object: p t F = i f mv mv t F - = v m t F = Here we will only consider motion and forces along a single line. The average force, F , is the net force on the object, but in the case where one force dominates all others it is sufficient to use only the large force in calculations and analysis. For this experiment, a dynamics cart will roll along a level track. Its momentum will change as it reaches the end of an initially slack elastic tether cord, much like a horizontal bungee jump. The tether will stretch and apply an increasing force until the cart stops. The cart then changes direction and the tether will soon go slack. The force applied by the cord is measured by a Force Sensor. The cart velocity throughout the motion is measured with a Motion Detector. Using Logger Pro to find the average force during a time interval, you can test the impulse-momentum theorem. F o r c e S e n s o r E l a s t i c c o r d M o t i o n D e t e c t o r OBJECTIVES Measure a cart’s momentum change and compare to the impulse it receives. Compare average and peak forces in impulses. MATERIALS Power Macintosh or Windows PC dynamics cart and track LabPro or Universal Lab Interface clamp Logger Pro elastic cord Vernier Motion Detector Vernier Force Sensor string 500-g mass

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PRELIMINARY READING AND QUESTIONS Read/Do/Explore the following: The Physics Classroom, Impulse: U4L1b, including CYU questions. All parts of this lab. 1. In a car collision, the driver’s body must change speed from a high value to zero. This is true whether or not an airbag is used, so why use an airbag? How does it reduce injuries? 2. You want to close an open door by throwing either a 400-g lump of clay or a 400-g rubber ball toward it. You can throw either object with the same speed, but they are different in that the rubber ball bounces off the door while the clay just sticks to the door. Which projectile will apply the larger impulse to the door and be more likely to close it? Explain. 3. Sketch plots of position vs. time, velocity vs. time, force vs. time, and force vs. position for the time period between release and capture of the cart. The time axes for the first three should be aligned vertically.
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lab 7 report - Impulse and Momentum The impulse-momentum...

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