Online Friction Lab

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School

California State University, Fullerton *

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Course

225L

Subject

Mechanical Engineering

Date

Dec 6, 2023

Type

docx

Pages

8

Uploaded by MateMaskButterfly85

Report
fd173269f8ad715f218f765fa56dbd4e96afe2eb.docx 9/21/2020 5:07 AM 1 of 8 Online Friction Lab Purpose To use a pHet simulation Forces and Motion Basics https://phet.colorado.edu/en/simulation/forces- and-motion-basics to investigate the laws of physics governing friction. Objectives 1. To understand the effect of the forces of friction on the motion of objects. 2. To explore experimentally the static and kinetic coefficients of friction. Technical Requirements This lab uses a free simulation from pHet from the University of Colorado. It is available at the following link: https://phet.colorado.edu/en/simulation/forces-and-motion-basics This is an HTML5 simulation. The technical requirements are as follows: HTML5 sims can run on iPads and Chromebooks, as well as PC, Mac, and Linux systems. iPad: iOS 12+ Safari iPad compatible sims Android: Not officially supported. If you are using the HTML5 sims on Android, we recommend using the latest version of Google Chrome. Chromebook: Latest version of Google Chrome The HTML5 and Flash PhET sims are supported on all Chromebooks. Chromebook compatible sims Windows Systems: Microsoft Edge, latest version of Firefox, latest version of Google Chrome. Macintosh Systems: macOS 10.13+, Safari 13+, latest version of Chrome. Linux Systems: Not officially supported. Please contact phethelp@colorado.edu with troubleshooting issues. More information can be found at https://phet.colorado.edu/en/help-center/running-sims#q66-header Have a Mac? Mac help can be found at: https://phet.colorado.edu/en/help-center/running-sims/mac For best results it is strongly recommended that you run the sim on a computer, not a phone. If you use a mobile device you assume all risk.
fd173269f8ad715f218f765fa56dbd4e96afe2eb.docx 9/21/2020 5:07 AM 2 of 8 Instructions 1. To access the sim click the following link: https://phet.colorado.edu/en/simulation/forces-and-motion- basics You should you will see the following screen If you wish to run the lab in a browser (online access) click the start button in the middle of the picture. You can also download the html5 file to your computer and run it off-line by clicking the Download button. If you have a fast computer or a slow internet connection or if you have trouble running it in a browser please try this option! The file will be a html5 file probably located in your downloads folder. Clicking on the file will start the sim. 2. When the sim starts you will see the following screen: Part 1: Static Friction In the following assume all numbers are accurate to 3 significant digits. 1. Click on “Acceleration”. Your screen will look like this (I have marked the yellow Forces box, the Stop button and the orange Reset button):
fd173269f8ad715f218f765fa56dbd4e96afe2eb.docx 9/21/2020 5:07 AM 3 of 8 2. Select all of the checkboxes in the yellow Forces box: Forces, Sum of Forces, Values, Masses Speed and Acceleration. Click the Stop button under the yellow Forces box to turn it into a Start button. This will freeze the sim so that you do not overshoot the maximum static friction force. Keep the slider that regulates the friction at the center of the scale (do not touch it). 3. Replace the crate with the 40 kg kid by dragging the crate to the lower left box next to the other crate and dragging the kid to replace the crate. 4. The double headed arrows under Applied Force add force in 50 N increments in that direction. The single headed arrows add 1 N per click. The opposite arrows subtract force in similar increments. 5. Add 100 N of force to one side of the kid by clicking the right side double headed arrow under Applied Force twice. At this point your screen will look like this: 6. The net force and the acceleration are still zero but the kid is just ready to move. This is the maximum static friction case for the 40 kg kid. 7. Test this statement by adding 1 N of force by clicking the single headed right arrow. The net force changes to 1 N to the right. The screen looks like this:
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