Here, we want to find a part of the graph where there is a line to show a constant change in velocity with respect to time. We solved for our experimental gravity for the trials (which is 2 times A, where A is the coefficient of the squared term of the equation given when you put on a curve fit) then solved for the percent error to show how close we were to solving for the accepted value for gravity, which is 9.8 (m/s)^2.Ĭhange the y-axis label on the graph from position to velocity to show the velocity vs. time graphs to see what the equation would be that described the ball's motion of each trial. We collected 5 of our best trials and saved their data. After we had the trials we wanted, we set a curve fit on all 5 position vs. time graph that has a negative quadratic parabola. Once everything is hooked up and set, hit the "Collect" button, and throw the ball above the motion detector until it hits the ground and you see a position vs. Set up the motion detector face up underneath the wire basket but in a space where none of the wires of the basket interfere with the motion detector. Also, make sure the motion detector is hooked up to the Lab Pro Interface, which also needs to be plugged into the computer's USB slot. time graph which is where we will be collecting our data from. To begin this lab we loaded the Logger Pro software and opened the file, "graphlab", which contained the settings needed to run this lab. In this lab we are trying to find the acceleration of gravity by measuring a the fall rubber ball with the motion detector hooked up to the Lab Pro Interface and collect the data onto Logger Pro where it will record it all. Logger Pro will also create a graph of both the velocity of the ball and the acceleration. We will look at these graphs to solve for the acceleration of gravity. We did this lab to serve to purposes: to determine the acceleration of gravity from a free falling object, and to gain experience using the computer software to collect data.
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