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Lab Experiment 6
Intro Physics Lab I (PHY 012)
Lehigh University
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Friction Physics 12 Experiment 6 Lab Report Fall 2020 The purpose of this lab is to learn about the properties of friction in specific incline angles using the computer program Capstone. The force of friction curve will be recorded for an object pulled up an incline at constant speed, and the static and kinetic coefficients will be determined between a sled and a track. Procedure: 1) Record the value of the wooden crate in the lab report with measurement error. 2) Determine the value of the applied force when the object starts to move changing the values of the force until it just starts to move, report this value in the lab report. 3) Using the method, determine μ s between the box and the ground with error. 4) Determine μ k changing the applied force value until the of reading above the box is zero, while the box moves at a constant velocity. 5) Using the method, determine μ k between the box and the ground with error 6) Compare the value of μ s with the value of μ k. 7) Put another box on top of the first box in the simulation and record this mass in the lab report with error. 8) Determine the value of the of the applied force when the 2 boxes start to change the values of the force until the boxes just start to move and record this value in the lab report with error. 9) Using the method, determine the value of μ k between between the box and the ground with error. 10) Determine the value of the of the applied force when the 2 boxes start to change the values of the force until the boxes just start to move and record this value in the lab report with error. 11) Use the method to determine the value of μ k between the box and the ground with error. 12) Compare the new value of of μ s with the new value of of μ k. 13) Theorize what the effect of mass has on of μ s and of μ k. 14) Determine how the mass placed in the cart affects the values of μ s and of μ k. Data and Calculations: of 1 Box: μs Fpush mg μs,avg Fpush,avg 129N 0 μs,max Fpush,max 129 N 0 μs,min Fpush,min 128 N 0 μs,error ( μs,max μs,min ) 2 μs,error ( 0 0 ) 2 μs,error 0 μs μs,avg μs,error (0 0) μk Fpush mg μk,avg Fpush,avg 95N 0 μk,max Fpush,max 95 0 μk,min Fpush,min 94 0 μk,error ( μk,max μk,min ) 2 μk,error ( 0 0) 2 μk,error 0 1) mass of wooden crate: (50 0) kg 2) applied force: (129 0) N 3) applied force to move box at constant velocity: (95 0) N 6) The value of μs is somewhat larger than the value of μk . These results do agree with theoretical predictions because the force it takes to keep an object in motion is always smaller than the force it takes to set it into motion. 7) mass of both crates: (100 0) kg 8) applied force: (252 0) N 10) applied force to move boxes at constant velocity: (189 0) N 9) 12) The value of μs is still somewhat larger than the value of μk of the 2 boxes. These results do agree with theoretical predictions because the force it takes to keep an object in motion is always smaller than the force it takes to set it into motion. 13) According to our theoretical equations, a change of mass have an effect on the values of of μs or μk. This is true because as mass increases, so does Fpush. In the equations 7 and 8, a greater mass is counterbalanced a greater Fpush. 14) According to our experimental results, the mass being pushed does not have any effect on the values of of μs or μk. The values of of μs and μk for 50 kg are (0 0) and (0 respectively, while the values of μs and μk for 100 kg are (0 0) and (0 respectively. Conclusion: The obtained experimental values supported the theoretical equations that mass has no effect on either of the coefficients of friction, so I believe the objectives were met and the entire lab was successful. The values of μs for the 50kg and 100kg masses were both (0 0), while the values of μk for the 50kg and 100kg masses were very similar to each other: (0 and (0 respectively. Larger masses mean a larger Fpush, which both cancel each other out in equations 7 and 8 to obtain the same coefficient of friction. Error Analysis: The main source of error in this experiment would be systematic error, which would be introduced the friction simulation. This program introduces its own error because such programs are often susceptible to bugs and other errors which skew the measurements, although rare. Another instance of error in this program would be the measurement of the applied force, since it only increases intervals of 3 or 4 Newtons. F pull would therefore more likely be inaccurate, since the exact Fpull could be a value that provided in the program. If the Fpull was measured to be larger than it actually is, the values of μs and μk would be larger. The opposite is true if Fpull was measured to be smaller than it actually is.
Lab Experiment 6
Course: Intro Physics Lab I (PHY 012)
University: Lehigh University
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