3. Choose two different shoes (sneaker and dress shoe, work boot and slipper, etc.). These can be your own or someone else's (those of spouse, child, friend, etc.) They do not have to be new- use whatever you have, in any condition. 4. Place one shoe at one end of a ramp of any material that will not bend or deform under the shoe's weight. (Use wood, metal, plastic, or even heavy-duty cardboard for the ramp.) Make sure the sole of the shoe and the ramp are relatively clean of debris. a. Slowly raise the "shoe end" of the ramp until the shoe begins to slide. Measure and record the angle of the ramp just as sliding begins. You can measure the angle with a protractor or using a height measurement and a trig function. NOTE: The shoe doesn't have to slide all the way down the ramp; actually, you want to capture the angle at which shoe begins to move. b. Do this six times. Note that your angles should be fairly consistent. If any angle seems inconsistent with the other angles, discard it and try again. In the end, you should have six consistent (but not necessarily equal) angles. 5. Repeat the process with the second shoe. Analysis 1. Using the six measured angles for each shoe, find the average angle at which each shoe begins to slide. 2. Using the equation we derive in class, calculate us for each shoe using the average angle for each shoe. Only one calculation is needed for each shoe. 3. Is average us the same for each shoe? How closely does average #s match accepted values? Some accepted values or ranges can be found at https://www.engineeringtoolbox.com/friction- coefficients-d 778.html. If you can't find the coefficient for your combination of materials, google the materials (for example, "coefficient of static friction between leather and cardboard" and see what you can find.) Alternatively, consider some close to your surface materials and note this in your presentation.
3. Choose two different shoes (sneaker and dress shoe, work boot and slipper, etc.). These can be your own or someone else's (those of spouse, child, friend, etc.) They do not have to be new- use whatever you have, in any condition. 4. Place one shoe at one end of a ramp of any material that will not bend or deform under the shoe's weight. (Use wood, metal, plastic, or even heavy-duty cardboard for the ramp.) Make sure the sole of the shoe and the ramp are relatively clean of debris. a. Slowly raise the "shoe end" of the ramp until the shoe begins to slide. Measure and record the angle of the ramp just as sliding begins. You can measure the angle with a protractor or using a height measurement and a trig function. NOTE: The shoe doesn't have to slide all the way down the ramp; actually, you want to capture the angle at which shoe begins to move. b. Do this six times. Note that your angles should be fairly consistent. If any angle seems inconsistent with the other angles, discard it and try again. In the end, you should have six consistent (but not necessarily equal) angles. 5. Repeat the process with the second shoe. Analysis 1. Using the six measured angles for each shoe, find the average angle at which each shoe begins to slide. 2. Using the equation we derive in class, calculate us for each shoe using the average angle for each shoe. Only one calculation is needed for each shoe. 3. Is average us the same for each shoe? How closely does average #s match accepted values? Some accepted values or ranges can be found at https://www.engineeringtoolbox.com/friction- coefficients-d 778.html. If you can't find the coefficient for your combination of materials, google the materials (for example, "coefficient of static friction between leather and cardboard" and see what you can find.) Alternatively, consider some close to your surface materials and note this in your presentation.
University Physics Volume 1
18th Edition
ISBN:9781938168277
Author:William Moebs, Samuel J. Ling, Jeff Sanny
Publisher:William Moebs, Samuel J. Ling, Jeff Sanny
Chapter1: Units And Measurement
Section: Chapter Questions
Problem 63P: The average density of the Sun is on the order 103kg/m3 . (a) Estimate the diameter of the Sun. (b)...
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Question
Shoe 1# Average angle: 15.17
Shoe #2 Average angle: 19.33
Transcribed Image Text:C
Shoe #1
15
16
15
14
16.
15°
7 Average 15.17
Shie #2
EF =
22
20
17
16°
What is the coefficient of
static friction ?
What is the us for each shoe? use the
Average Angle for each.
{
Σ Fy = 0
22°
19°
MAX
formula provided: fs max = Ms N
"point of impending motion"
> Aug 19.33
O
U sin O - FSMAX =0
W sin 0 = fsmax
3
N-Weos 0 =0
W cos O N
W sin 0= Ms N
Mog
W sin 0= M₂.
whi
во sin o
to us o
W cos
O
Ms
HAN - Mlg
Transcribed Image Text:Read aloud
+0 1 of 2
CL
3. Choose two different shoes (sneaker and dress shoe, work boot and slipper, etc.). These can be
your own or someone else's (those of spouse, child, friend, etc.) They do not have to be new
use whatever you have, in any condition.
4. Place one shoe at one end of a ramp of any material that will not bend or deform under the shoe's
weight. (Use wood, metal, plastic, or even heavy-duty cardboard for the ramp.) Make sure the
sole of the shoe and the ramp are relatively clean of debris.
a.
Slowly raise the “shoe end" of the ramp until the shoe begins to slide. Measure and
record the angle of the ramp just as sliding begins. You can measure the angle with a
protractor or using a height measurement and a trig function. NOTE: The shoe doesn't
have to slide all the way down the ramp; actually, you want to capture the angle at which
shoe begins to move.
b. Do this six times. Note that your angles should be fairly consistent. If any angle seems
inconsistent with the other angles, discard it and try again. In the end, you should have
six consistent (but not necessarily equal) angles.
5. Repeat the process with the second shoe.
Analysis
1. Using the six measured angles for each shoe, find the average angle at which each shoe begins to
slide.
2.
Using the equation we derive in class, calculate us for each shoe using the average angle for each
shoe. Only one calculation is needed for each shoe.
3.
Is average us the same for each shoe? How closely does average #s match accepted values?
Some accepted values or ranges can be found at https://www.engineeringtoolbox.com/friction-
coefficients-d 778.html. If you can't find the coefficient for your combination of materials,
google the materials (for example, "coefficient of static friction between leather and cardboard"
and see what you can find.) Alternatively, consider some close to your surface materials and note
this in your presentation.
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