Chapter 6 - Coefficient of Friction Virtual Lab (Spring 2021)

Master friction with our interactive virtual lab! Calculate static & kinetic coefficients, analyze forces.

Objectives Listen to the description...LINK HERE Prelab #1: The direction of a frictional force is always in the (opposite / same) direction as the motion or the intended motion of an object. Prelab #2: What is the difference between the coefficients of static and kinetic friction? Describe the movement of the surfaces in your answer. Prelab #3: A block of mass 12.0 kg rests on a horizontal surface. The coefficient of static friction between surfaces is 0.450. What is the maximum possible force that could act on the block before it begins to move? (Upload your math as a picture file using this icon below: Prelab #4: What is the relationship between the force of kinetic friction and the speed of the moving (sliding) object? Procedure Link to the lab: HERE1. Read the information on the front page and when you are ready, click 'Begin.'2. Before clicking on anything, record the mass of the object into the table below. Be sure to convert it into kilograms, but leave off the units.3. Based on the mass, find the weight of each object on the surface and place it in the table, but leave off the units. **If you change the page, you will have to restart, so be sure to collect your data all in one sitting**4. Click ‘Start’ and run your first trial of Rubber on Ice.5. Below the apparatus, a graph will display the amount of force per time as tiny tick marks. Find the value of force that occurs at the greatest point of the slant and record it in the table under the FA for Static Friction, but leave off the units.6. Find the average value of force for the horizontal line and place this under the FA for kinetic friction, but leave off the units. The object began moving once the graph changed slopes. Draw Rubber on Ice on the graph below. Example of where to find the info for steps 5 and 6:7. Draw a free body diagram below and then use your equation for calculating friction to determine the coefficient of static and kinetic friction. Record your answers in the table below. (Three sig figs)8. Click ‘Reset’ once you are done and then click on ‘Types of Surfaces’ to choose the next in the list.9. Repeat the above steps 4-8 until you have chosen all of the surface and object combinations and input all of your data in the table, but leave off the units. Determining the value of the coefficient of frictionDraw a free body diagram for one scenario.Solve for the coefficient of friction (μs or μk) without using numbers to create a relationship. Your answer may include variables such as FA, m, and g.The equation will read μ = (Something / Something)Then, use the data in your table to calculate the coefficient of friction for each block using the equation variation that you found above.Repeat for both static and kinetic friction. Attach your work as a picture file here. Data Table for Static Friction Fill in each box in the table, but do not include units. Numbers only. Surface Type Mass (kg) Weight (N) FA for Static Friction (N) Coefficient of Friction Rubber / Ice 1.034 10.1332 1.20 0.115 Aluminum / Steel 1.034 10.1332 6.40 0.632 Glass / Glass 1.034 10.1332 9.40 0.928 Graphite / Graphite 1.034 10.1332 1.80 0.178 Wood / Lab Table 1.034 10.1332 5.00 0.493 Data Table for Kinetic Friction Fill in each box in the table, but do not include units. Numbers only. Surface Type Mass (kg) Weight (N) FA for Kinetic Friction (N) Coefficient of Friction Rubber / Ice 1.034 10.1332 0.76 0.075 Aluminum / Steel 1.034 10.1332 4.70 0.464 Glass / Glass 1.034 10.1332 4.00 0.395 Graphite / Graphite 1.034 10.1332 1.63 0.161 Wood / Lab Table 1.034 10.1332 2.24 0.221 Graph of Rubber on Ice Draw in your "points" or lines where they belong. Free Body Diagram of the Block Draw and label all forces. For friction, just leave it as f. Conclusion #1: What did you notice about the coefficients of static friction compared to the coefficients of kinetic friction for each surface? Why is this the case? Conclusion #2: What are the units of the coefficient of friction? Conclusion #3: Which surface combination had the greatest static and kinetic friction combo? Conclusion #4: Based on the graphs, how can you see the comparison between static and kinetic friction?