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
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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.
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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):
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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:
Your preview ends here
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|%EE l, I1.
a T:0Y
1 aiymaatb5m
تسجيل
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Example #4 : The coefficient of friction between the 20KN block A and the 40KN block
B of Figure below is 0.40. The coefficient of friction berween block B and the
horizontal plane is 0.15. Determine the force P required to cause motion of block A to
impend to the right.
SOLUTION :
There are 2 case for this problem :
Case 1 about the force P will cause motion of A
to impend to the right alone without moving
Block B
Case 2 about the force P will cause motion of A
to impend to the right with moving Block B with
it in same time.
تم انضمام علي عصام کاظم حميد إلى الاجتماع.
۳۷ مشارك آخر
Salam
عبد الوهاب
أنت
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Use graph above
Two blocks are positioned on surfaces, each inclined at the same angle of 57.6
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What is must be the mass of the white block if both blocks are to slide to the RIGHT at an
acceleration of 1.5 m/s^2?
4.55 kg
2.03 kg
1.94 kg
2.50 kg
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Last digit is=0
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SET B1
Topic: Statics of Rigid Bodies
Note: If you have already answered the problems in this post, kindly ignore it. If not, then answer it. Thank you, Tutor!
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C
Dynamic Analysis and Aeroelasticity
SECTION B
Answer TWO questions from this section
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b) What is the rotor's angular velocity (in RPM) when it has turned ten
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CASIO
fx-991ES PLUS
ALPHA
CALC
EGO
the car move ?
[Ans. NA 16.5 kN, Ng =42.3
kN, the car does not move]
%3D
5. A box weighs 150 kg. The coefficient of static friction
between the box and the ground is 0.3. Determine if the
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coefficient of static friction between the man's shoes and
the ground is 0.4.
Hint: analyse block and man separately i.e. draw separate FBDS
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F(t)
Force_Crate
Known values:
Mass of Block
68 kg
TT
Hs μk
0
0.63 0.53 26°
Problem Statement:
A crate is initially at rest on a sloped surface, when a force is applied: F(t)
where t is in seconds.
Answers:
When t=44.47 seconds, the crate has not yet started moving.
Find the magnitude of the friction force at that time:
317.771 N
The direction of the friction force at that time is: down the slope
Find the time required for the crate to start moving:
Find the crate's speed when t=174.9 s: 9.485 m/s
Be sure to include units with your answers.
169.756 S
240+0.2 N,
arrow_forward
Help
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February 7,
2021
H.W MECHANICS PHrsics
Example 5.13 Friction in horizontal motion
You want to move a 500-N crate across a level floor. To start the
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Once the crate "breaks loose" and starts to move, you can keep it
moving at constant velocity with only 200 N. What are the coeffi-
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Example 5.15 Minimizing kinetic friction
In Example 5.13, suppose you move the crate by pulling upward
on the rope at an angle of 30 above the horizontal. How hard must
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Example 5.16 Toboggan ride with friction I
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Dear,
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- |%EE l, I1. a T:0Y 1 aiymaatb5m تسجيل A Powetoint Presentation - Adobe acmbor Reader DC G2-bit) File Esit View Sign Window Help Home Tools PowerPrint Present. Sign In Example #4 : The coefficient of friction between the 20KN block A and the 40KN block B of Figure below is 0.40. The coefficient of friction berween block B and the horizontal plane is 0.15. Determine the force P required to cause motion of block A to impend to the right. SOLUTION : There are 2 case for this problem : Case 1 about the force P will cause motion of A to impend to the right alone without moving Block B Case 2 about the force P will cause motion of A to impend to the right with moving Block B with it in same time. تم انضمام علي عصام کاظم حميد إلى الاجتماع. ۳۷ مشارك آخر Salam عبد الوهاب أنتarrow_forwardHow do I find the work done by friction in the problem? Will there be thermal energy conserved?arrow_forwardUse graph above Two blocks are positioned on surfaces, each inclined at the same angle of 57.6 degrees with respect to the horizontal. The blocks are connected by a rope which rests on a frictionless pulley at the top of the inclines as shown, so the blocks can slide together. The mass of the black block is 6.42 kg, and the coefficient of kinetic friction for both blocks and inclines is 0.560. Assume static friction has been overcome and that everything can slide. What is must be the mass of the white block if both blocks are to slide to the RIGHT at an acceleration of 1.5 m/s^2? 4.55 kg 2.03 kg 1.94 kg 2.50 kgarrow_forward
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