lab exercise 2

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INITIAL PARAMETERS QUESTION 1: What is the distance between two marks in your inclined plane? 25 cm QUESTION 2: What is the angle of your inclined plane with respect the horizontal? (0° would mean the inclined plane totally horizontal, so the ball would not move; 90° would mean the board totally vertical) 6 degrees QUESTION 3 Newton’s first law says a body at rest will remain at rest unless acted upon by an outside force, and a body in motion will continue in motion at the same speed and in the same direction unless acted upon by an outside force. What forces were acting on the marble as it traveled down the ramp? Gravity was forcing the marble down the ramp while air resistance and friction from the board slowed the acceleration very slightly. QUESTION 4 Did the measured acceleration was about the same for the three (or four) sections of the experiment (Release point to 1 st marking, to 2 nd marking, etc) ? No, as the marble went further the acceleration slowed as it went closer to its terminal velocity. QUESTION 5 Do you expect this acceleration to be constant or different for the three (or four) sections of this experiment? Explain your reasoning. I expect the acceleration rate to slow down as the marble gets closer to its terminal velocity. Copyright © 2017 by Thomas Edison State University. All rights reserved.

QUESTION 6 By looking at the Standard Deviation results for the calculated acceleration, which section of this experiment is the more precise? Explain your reasoning. Release point to the second marking was the most precise at .0030. This section had the lowest score for the standard deviation for acceleration. QUESTION 7 What was the average value of acceleration for the most precise section of this experiment? .7482 QUESTION 8 Intuitively, we can understand that the velocity (and therefore the acceleration) of the ball will increase as we increase the angle of the inclined plane. We can make the assumption that the acceleration of the ball is equal to: the incline or angle of the plane. Expected acceleration = (5/7)gsin( θ ) where g=9.8 m/s 2 The angle of the inclined plane is the value that you measured in Question 2 and transcribed into the table. Using the measured value of the angle of the inclined plane, calculate the expected value of the acceleration. (5/7)gsin( θ )=.7317 QUESTION 9 Calculate the relative error between the measured value of acceleration (from Question 7) and the expected value of acceleration (from Question 8). .0165 QUESTION 10 What do you think are the elements that may contribute to increasing this error? How would you solve them? Some factors that can affect the acceleration are the friction from the board that I used and the air resistance on the marble. Using the estimated acceleration calculated in question 8 we can assume that the friction is equal to the difference observed in question 9. Copyright © 2017 by Thomas Edison State University. All rights reserved.

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The purpose of this experiment was to show how the rate of acceleration of an object changes as an object gets closer to its terminal velocity. For this experiment, I used a board that was inclined at 6 degrees to conduct the experiment. I measured sections that were 25 cm apart to conduct this experiment. I would have chosen a longer length but this was the only board I had at the time and it was not long enough to do longer sections. The biggest spot that I had issues with was the units of measurements. I conducted my experiment in centimeters and had to redo all of the calculations for meters once I realized that I had used the wrong units of measurements for my calculations. Copyright © 2017 by Thomas Edison State University. All rights reserved.

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