![]() The smaller disk should roll faster than large disk on the same inclined angle because lighter mass and lower mass moment of inertia. The expected result from this experiment is to initially have the experimental value of the rolling disks to be smaller than the theoretical value and as the angle of inclination is increased experimental values should be bigger as the disks start to slip since the static friction cant support the increased acceleration. Using the recorded time the experimental value was calculated. The time taken for the disk to roll from rest to the next point was recorded. The disk was places at the starting point of the inclined plane and released allowing it to roll to another point. The experiment was conducted using an inclined plane with angulometer. The experimental value is calculated by using a simplified kinematics equation for angular motion,, while the theoretical value is calculated from the summation of moments using mass moment of inertia formula. Text of rolling disk lab report (applied dynamics)ĪBSTRACT.2OBJECTIVE.3INTRODUCTION.3THEORETICAL BACKGROUND.3EQUIPMENTS.6PROCEDURES.6RESULTS.7SAMPLE CALCULATIONS9DISCUSSION.10CONCLUSION.11ĪBSTRACTThe experiment was designed to be conducted so as to determine the theoretical and experimental angular acceleration of a big and a small rolling disk. The expected result from this experiment is to initially have the experimental value of the rolling disks to be smaller than the theoretical value and as the angle of inclination is increased experimental values should be bigger as the disks start to slip since the static friction can’t support the increased acceleration. The experimental value is calculated by using a simplified kinematics equation for angular motion, θ ̈=2θ/t^2, while the theoretical value is calculated from the summation of moments using mass moment of inertia formula, ∑▒M_o =I_o θ ̈. If you want something smaller and self-contained, write something with RRDTool.The experiment was designed to be conducted so as to determine the theoretical and experimental angular acceleration of a big and a small rolling disk. If you want something to easily graph almost anything, use munin. ![]() RRDTool uses a rolling-database system to store it's data, so the file will never get bigger than about 50-100KB, and it's consistently quick to graph as the file is a fixed length. The graph will get progressively slower to graph. Why? The log file will get bigger, and bigger, and bigger. I really really don't recommend you use something like this. That'll make a simple ascii graph of the disc usage. Line_length = int(round(normalised * 28)) # make a graph between 0 and 28 characters wide Normalised = base / (biggest - smallest) # normalise value between 0 and 1 Lines = īase = (cur_line - smallest) + 1 # make lowest value 1 import osĭisc_usage = os.system("df -h / | awk ''") If you want something really, really simple, you could do. Munin, MRTG and Cacti are basically all far-nicer-to-use systems based around this graphing tool. You could also write something similar using rrdtool. I would describe how it's setup, but the munin site will do that far better than I could! Once I got it installed (currently slightly difficult on OS X, but it's trivial on Linux/FreeBSD), I had written a plugin in a few minutes, and it worked, first time! I've set it up on my laptop to monitor disc-usage, bandwidth usage (by pulling data from my ISP's control panel, it graphs my two download "bins", uploads and newsgroup usage), load average and number of processes. And debugging the plugins is very easy (compared to MRTG) The plugin output format is basically disc1usage.value 1234. They can be written in almost anything (shell script, perl/python/ruby/etc, C, anything that can be execute and produce an output). Writing Munin plugins is very easy (it was one of the projects goals). sort of like MRTG (but MRTG is primarily aimed at graphing router's traffic, graphing anything but bandwidth with it is very hackish) It is designed for exactly this sort of thing - graphing CPU usage, memory usage, disc-usage and such.
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