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Name of Student: Name of Teacher: Coefficient of Friction Virtual Lab
Introduction:
This lab will let you determine the coefficients of static friction and kinetic friction between different surfaces. You will be pulling with increasing tension until the object begins to slide and then you will keep the object moving at a slow steady speed. The graph below the action is a graph of the tension in the string.
The Friction Coefficient simulation
: http://thephysicsaviary.com/Physics/Programs/Labs/ForceFriction/index.html
Procedure
1.
When you are ready to start the experiment, click on the Begin
button.
2.
Choose a mass of 221g (or any mass in the 200’s) by clicking on the arrows found in the center of the simulation. Be sure to record this value in the data table. Make sure to convert it into kilograms.
3.
Choose the type of surface by clicking on the names of the type of surfaces listed.
4.
Click the Start
button.
5.
Take a screenshot of the first graph that you produce. You may have to scroll down on the Web page to see the graph.
6.
The first section of the graph represents static friction. Notice that the static friction value increased until it reached a maximum value. Record that maximum value in your data table.
7.
The second relatively horizontal portion of the graph represents the kinetic force of friction. Record a force that is vertically in the middle of the series of points.
8.
Repeat the steps choosing two other values of masses around 425 g and 725 g. You will have to press the Reset button after every trial.
9.
Choose two other types of surfaces and complete three trials using the same masses as you did with Rubber on Ice.
10.
On completing the data, do the calculations.
Determine the normal force. (You might need to draw the FBD to see what the equation is in the y- axis)
Calculate the coefficient of friction using the equation.
Data
Name of Student: Name of Teacher: Table I: Surface - Rubber and Ice
Mass (kg)
Normal (N)
Maximum Static Friction
(N)
Coefficient of Static
Friction
Kinetic Friction (N)
Coefficient of Kinetic
Friction
0.215
2.11
0.25
0.118
0.15
0.071
0.425
4.17
0.50
0.119
0.30
0.072
0.725
7.11
0.80
0.113
0.50
0.070
Table 1 FBD and Calculations:
Name of Student: Name of Teacher: Table 2: Surface – Aluminum on Steel
Mass (kg)
Normal (N)
Maximum Static Friction
(N)
Coefficient of Static
Friction
Kinetic Friction (N)
Coefficient of Kinetic
Friction
0.215
2.11
1.3
0.616
1.0
0.474
0.425
4.17
2.5
0.599
2.0
0.480
0.725
7.11
4.5
0.633
3.3
0.464
Table 2 Calculations:
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Related Questions
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Part A- Finding the het friction force
Learning Goal:
To set up and evaluate the equations of motion in a
normal-tangential coordinate system.
The car is traveling at a speed of 62.5 ft/s, which is increasing at a rate of 4.55 ft/s? , and the curvature of the road is
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A car of weight 3850 lb is traveling around a curve
of constant curvature p.(Figure 1)
• View Available Hint(s)
Figure
1 of 1>
F =
Value
Units
Submit
Part B - Finding the maximum allowable acceleration
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Suppose that the tires are capable of exerting a maximum friction force
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Express your answer to three significant figures and include the appropriate units.
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4. Two blocks mĄ =
3.0 kg and mB =
8.0 kg are on inclines and are connected together
by a string as shown in the figure below. The coefficient of kinetic friction between each
mass and its incline is uk
0.25.
MB
m
MA
51°
21°
Copyright © 2008 Pearson Education, Inc.
(a) If ma moves up, and mp moves down, determine their acceleration.
(b) What minimum value of µk will keep the system from accelerating?
1:50 PM
e Type here to search
C A
N
2/9/2021
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Problem 4.137
3 of 4
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I Review
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Replace the three forces acting on the plate by a wrench. Suppose
that FA = {450i}N, FB = {-350k} N, and Fc = {300j} N.
(Figure 1)
Part B
eТext
Determine the couple moment of the wrench.
Express your answer to three significant figures and include the appropriate units. Enter positive value if the sense of direction of the couple moment is the
same as that of the resultant force and negative value if the sense of direction of the couple moment is opposite to that of the resultant force.
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I will rate you with “LIKE/UPVOTE," if it is COMPLETE STEP-BY-STEP SOLUTION.
If it is INCOMPLETE SOLUTION and there are SHORTCUTS OF SOLUTION, I will rate you with “DISLIKE/DOWNVOTE.”
Topics related to the given problem:
Dynamics of Rigid Bodies, Kinetics of a Particle, Equation of Motion: Normal and Tangential Coordinates, Kinematics, etc.
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