M3.3 Laboratory Report 5 Worksheet answers
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Name: ___Demauri Simpson_______________________________________ M3.3 Laboratory Report 5 Worksheet
PhET Simulation: Friction
Instructions
Before you start to work on this worksheet, review the M3.3 Laboratory Report 9 Instructions
Submit your completed work to the M3.3 Laboratory Report 5 dropbox. See the Schedule and Course Rubrics in the Syllabus Module for due dates and grading information.
Objectives:
1. To understand one relationship between frictional force and normal force. 2. To calculate frictional force.
3. To determine the coefficients of static and kinetic friction.
Pre-Lab Activities:
1.
Open the simulation using the link to PhET Interactive Simulations at the University of Colorado Boulder:
https://phet.colorado.edu/sims/html/forces-and-motion-basics/latest/forces-and-motion-
basics_en.html
2.
Explore the four options available in the simulator
3.
In this laboratory investigation you will be using the Friction tab.
Part 1: KINETIC FRICTION
CLICK FORCES, SUM OF FORCES, VALUES, and MASSES
For each mass in the chart, push the object until it is moving fast then let go. The friction force by the red arrow will be your kinetic friction value (your first object should be 94 N)
Solve for the Force of Gravity (weight) for each mass Object(s)
Mass (kg)
Force of Gravity (N)
Fg=m(9.8 m/s
2
)
Normal Force (N)
Cancels gravity in this situation so same value as Fg Kinetic Friction Force (N)
1 box
50
490
490
94
Man
80
784
784
150
Girl + 1 Box
90
882
882
169
Trash can
100
980
980
188
Man + 1 box
130
1274
1274
244
Box + trashcan
150
1470
1470
281
Man + trashcan
180
1764
1764
338
Refrigerator
200
1960
1960
x
IF THE OBJECT DOES NOT MOVE EVEN WITH 500 N of force, place an X through the data as it means we cannot measure the kinetic friction (not moving) or find the static friction’s maximum value.
Open the graphical analysis and plot the graph Kinetic Friction vs. Normal Force
Record the m (slope) and b (y-int) value Insert the plotted graph in the lab report
The slope here represents our coefficient of friction (µ)
which you can think of as a measure of the stickiness between two surfaces. It is a measure of the ratio of friction and normal force. The subscript ‘k’ next to the µ indicates we are talking about kinetic friction’s coefficient, and an object that is in motion. The formula from the graph is:
F
fk
= µ
k
(F
N
)
Kinetic Friction = coefficient of kinetic friction x Normal Force
Your slope (m value) in the graph is the coefficient. Write it down µ
k
=0.1939
Part 2: STATIC FRICTION
CLICK FORCES, SUM OF FORCES, VALUES, and MASSES
For each mass in the chart, slide the slider SLOWLY until the mass starts to move
and record it your first object should be between 130 N and 140 N
This pushing force at the moment the mass starts to move at balances out the maximum static force, as such we can use that force as our static force.
Solve for the Force of Gravity (weight) for each mass. NOTE: Since we are attempting to apply a force slowly until we notice motion, we will have error in this experiment. Your graph will have data points slightly off the linear fit line. Object(s)
Mass (kg)
Force of Gravity (N)
Fg=m(9.8 m/s
2
)
Normal Force (N)
Cancels gravity in this situation so same value as Fg Static Friction Force (N)
1 box
50
490
490
125
Man
80
764
76
200
Girl + 1 Box
90
992
992
225
Trash can
100
980
890
225
Man + 1 box
130
1274
1274
325
Box + trashcan
150
1470
1470
375
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Man + trashcan
180
1764
1764
450
Refrigerator
200
1960
1960
x
IF THE OBJECT DOES NOT MOVE EVEN WITH 500 N of force, place an X through the data as it means we cannot measure the kinetic friction (not moving) or find the static friction’s maximum value.
Open the graphical analysis and plot the graph Static Friction vs. Normal Force
Record the m (slope) and b (y-int) value Insert the plotted graph in the lab report
Your slope (m value) in the graph is the coefficient. Write it down µ
s
=
Questions:
Write your coefficient (µ) from each friction.
Coefficient for STATIC (second graph):2551
Coefficient for KINETIC (first graph):1939
Compare your coefficients for static and kinetic friction and include your observations and conclusion in your completed lab report. Static forces will always have a larger frictional force and it also is harder to somtheing from the rest rhan when it is moving
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Part 2
Set up a spreadsheet solution to this problem. This will require that you derive one
formula to express the relationship between the friction coefficient, the spring constant,
and the spring compression; and a second formula to find the cost of using different slide
and spring types. Set up your spreadsheet as shown below. You can fill in the
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spreadsheet/Matlab work
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Part 3
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through the air and pass through a hole into the drop box. Using the slide you selected
above, determine how far below the slide (h) to place the hole in the drop box.
Yo = 5.2017/5
BLADE
2
RAMPE SLIDE
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SLIDE
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$'
Cost
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Part B
?
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point.
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