![]() ![]() Have already inadvertently taken some data), then click the "Go! button. When you are ready to take data, click the "Clear" button (in case you.Any rampĪngle works, but do you see how a smaller ramp angle will reduce error? Choose any ramp angle greater than 0.0 and less than 30 degrees.Note that negative positions are on the flat ground where the object will Choose any starting position greater than 0.0 with the position slider.(Sorry Galileo, we can just clear friction Does the object matter if it is a frictionless ramp? From the web, find and start The Ramp PhET.Vary the distance along the ramp rather than leaving the object in one placeĪnd making the same measurement 10 times.) Making the same measurement over and over (in other words, for this lab, we will From statistical analyses (see last lab), we canĪnd measure another, this will allow for an even better result rather than Measurements, we need to take multiple data points (to make the statistics We learned in the statistics labs that when making We will slide an object down the ramp, measure times for successively longer falls, and then analyze the data with the kinematic equations for one dimensional motion in order to find g, the local ![]() Lab if you forget how to access the PhET simulations. The Ramp PhET. See instructions from the earlier Motion and Error The objects' acceleration due to gravity. He rolled objects down ramps and from distances and times, was able to determine Introduction: Galileo was able to accuratelyĭetermine the value of g, but he did not have a video camera. In fact, the scatter of the data points around the best-fit line is due toįrom the expected value, can you come up with a possible and reasonable Now you can see how closely the data points lie to theīest-fit line. To display the best-fit line on the graph you should add a trendline asĭescribed in the Excel Hints. How do they compare to the expected values? Using the linest or regression command, determine the slope Should the slope and y-intercept represent? Your graph approximate a straight line as expected? What kinematic variables To be manipulated, have Excel do this, don't Create the columns of data that you are going to plot.Not expected to be linear, but velocity vs. Be careful! Be sure that you choose something to Decide which variables you are going to use to graph which will allow you.Hints: check out Excel Hints for graphing twoĬolumns of data, for trendlines, and statistics of the best fit This will only be used if you have exhausted all other Instructor may supply you with a video and accompanying dataset that has beenĬaptured for you. Copy the data set created into Excel.Īt worst, if none of the above will work for you, your The object by clicking on it frame by frame, and be sure to set the scale with With Video Physics, or video the falling object and copy the video to aĬomputer, and open it within LoggerPro (in LoggerPro: "Insert - Movie" from menuĪt top). Video the falling object, keeping the camera still, and have a knownĭistance (ruler, person whose height you know, something else with knownĭistance) in the image. You do need two poeple: one to hold and drop the object, and the other to You need to have a known distance or measuring instrument in the frame of the In video analysis, you will drop an object while videotaping it Program will allow you to measure the position vs. You can download and install LoggerProģ.15, instructions can be found at the class Moodle site. LoggerPro, which is available free to students in this course. Object, and download or send the video to your computer, and then open it up within OR you can also video the motion (without Video You can videotape a falling object, and then analyze the videoįrame by frame, described below. If you have an iPad or iPhone, you should download the Video ball, shoe, but not a sibling or a feather NOTE: For this lab there are two ways of measuring gĭiscussed below: Video Analysis and Galileo's Method. Kinematic variables velocity, displacement, or time, you can calculate Relationships used in class, you know that if you measure any two of the three Particular, measure the acceleration due to gravity. We will study the motion of a freely falling body and, in Physics 115 Measuring the Acceleration Due to Gravity ![]()
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