Physics Project Motion – Reaction Time Team Members: Oscar Omar Martínez Lujano Hugo Enrique Rivas Puente Omar David Saucedo Infante Alberto Franz Ruiz Varela Introduction Motion is a change in position of an object with respect to time and its reference point. Motion is typically described in terms of displacement, direction, velocity, acceleration, and time. Motion is observed by attaching a frame of reference to a body and measuring its change in position relative to that frame. Definition of the problem To prove how fast your body can react and move at the same time when an object is falling toward you. Hypothesis When we drop the yard stick our body will react as fast as it sees it falling. Materials • Yard stick • Chair to stand on Procedure 1. Have your friend hold a yardstick from the top so that it is up and down with the bottom several feet above the floor. Your friend may have to stand on a chair to do this. 2. You hold your fingers opposite the 18-inch mark, but dont touch the stick! Without warning your friend should let go of the yardstick, and you should try to catch it with your fingers. 3. Notice what inch mark your fingers are on when you catch the stick. Subtract this number from 18 or subtract 18 from the number to see how many inches the stick fell before you caught it. Try it several times to see if you get the same answer. Let your friend try to catch it while you drop it. Results Distance Dropped Reaction Time 2 inches 0.10 seconds 4 inches 0.14 seconds 6 inches 0.18 seconds 8 inches 0.20 seconds 10 inches 0.23 seconds 12 inches 0.25 seconds 14 inches 0.27 seconds 16 inches 0.29 seconds 18 inches 0.31 seconds Discussion or Analysis Gravity is pulling down on the yardstick at a constant rate. The longer it falls, the faster it goes. By measuring how far the yardstick falls, we can calculate the speed at which it is moving and the time it took you to catch it. Conclusion With these experiment we were able to determine that gravity has a constant acceleration in any given object. And calculate an approximate of gravity´s acceleration. Final Reflection Experiment like this help us better understand how physics, especially gravity works.
Posted on: Thu, 05 Dec 2013 05:31:21 +0000
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