M3.3 Laboratory Report 5 Worksheet answers

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Apr 3, 2024

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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