# Lab 2 - Experiment 2-1 (Falling Coins) Objective: To...

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Experiment 2-1 (Falling Coins) Objective : To demonstrate the rate of acceleration. Results, Explanations, Conclusion : For this experiment we placed a ruler parallel to the edge of a table. We then twisted it slightly so that one end of it is hanging over the edge about 2 inches and the other is 2 inches away from the edge. Then a penny was placed on top of the ruler that was hanging over the edge. At the opposite end, we placed a second penny on the table between the ruler and the edge of the table. Using two fingers, we grabbed the center of the ruler and quickly turned it so that it is parallel to the edge again. We then observed the paths that the coins made. This experiment was then tried with different sized coins such as a nickel and dime and then a penny and quarter. The coin that went off of the ruler went at an arc while the coin that was dropped right off the edge went straight down. Although their paths of falling were different, it did not affect their times of fall because they both fell at the same time. By this example, it shows that the effect of gravity was the same on horizontal and vertical objects because they were accelerating at the same rate. The mass of the coin did not affect the rate at which it falls because the force of gravity is a constant acceleration at 9.8 m/sec. This experiment shows that objects falling, whether straight down or at an arc, will fall with the same rate of acceleration. Teaching Applications : -“Play Ball”: In this experiment have children throw a baseball. At the same time have the children drop a baseball from the same height. Have them observe how fast the balls seem to be accelerating downward and if they reach the ground at the same time. If done correctly the balls will reach the floor at the same time. This shows that no matter if the object is thrown vertically or horizontally, they will have the same rate of acceleration. -“Vacuuming Objects”: For this experiment have the children watch a video in which a feather and a rock have been dropped. Have them observer how the rock will drop faster because it has more mass. Then have them watch what will happen when the feather and rock are dropped in a vacuum. They will observe that they fall at the same time. This shows that objects have the same rate of acceleration in the absence of friction. http://www.youtube.com/watch?v=_XJcZ-KoL9o Diagram :

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Experiment 2-2 (Air Resistance) Objective : To demonstrate terminal velocity. Results, Explanations, Conclusion : For this experiment we held a piece of paper in one hand and a book in the other. We then would drop the book and the piece of paper at the same time. We observed them as they would fall to the floor. Then we placed the piece of paper directly on top of the book without the paper hanging over the book. Holding the book and paper above our waist, we dropped it and observed what happened to the book and paper as it fell. When the paper and book were dropped separately the book fell first because the paper
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## This note was uploaded on 03/16/2011 for the course PHYSICAL S 110 taught by Professor Reese during the Fall '10 term at BYU.

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Lab 2 - Experiment 2-1 (Falling Coins) Objective: To...

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