PM - 13.7 Lab Proposal (1)

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Name: Prachet Mahawar Title: Friction Experiment: Wooden Block and Surfaces Date: December 3, 2023 Background: Purpose: This experiment aims to investigate the coefficients of static (μS) and kinetic (μK) friction using a wooden friction block and different surfaces. Hypothesis: If the nature of the surfaces changes, then the coefficients of static and kinetic friction with the wooden block will also change accordingly. Variables: - Independent Variable: Nature of the surfaces - Dependent Variables: Coefficient of Static Friction (μS), Coefficient of Kinetic Friction (μK) - Controlled Variables: Normal force (maintained constant), Applied force (gradually increased) Experimental Setup: Wooden Friction Block: Use the wooden friction block to measure friction. Materials: Select two materials to represent the surfaces you will be testing Weighing Setup: Use the digital balance to measure and control the normal force by placing weights on a hanging hook over a ledge. Flat Surface: Prepare a flat surface where the friction experiment will occur. In this experiment, the object (labeled above) will be the friction Block and the Force will be the slotted weight hanger attached by a string.
Parameters to be Measured: - Maximum force of static friction (before the wooden block starts moving) - Force of kinetic friction (while the wooden block is in motion) Data Analysis: The coefficients of friction will be calculated using the following formulas: Coefficient of Static Friction (μS): μS = (Maximum Force of Static Friction) / (Normal Force) Coefficient of Kinetic Friction (μK): μK = (Force of Kinetic Friction) / (Normal Force) Materials - Wooden friction block - Sandpaper - Aluminum Foil - Digital Balance - Weights - Safety goggles - Stopwatch - String - Protractor - Ruler - masking Tape - Slotted Hanging Weight Set Procedure 1. Read through the entire procedure and prepare to collect your data before beginning carefully. 2. Be sure to setup your experiment in a quiet place away from any food or drinks and distractions. 3. Predetermine a known distance using a ruler and mark it with masking tape. 4. Place the flat surface on a stable table or workbench. 5. Select the first material (e.g., sandpaper) and place it on a flat surface. 6. Place the wooden friction block behind the initial tape line on the material and gradually add weights using the weighing setup until the block is on the verge of moving. 7. Record the mass added and the corresponding maximum static friction force. 8. Once the Friction block starts to move slightly, start the stopwatch until the block moves across a known distance. 9. Once the friction block moves across your known distance on your experimental surface, stop the timer and record how long it takes. 10. Record the time taken for the block to travel a known distance to calculate the force of kinetic friction. 11. Repeat the experiment using a different material and conduct at least 3 trials with the same material to achieve consistent results. 12. Return all materials to their proper place, clean the workspace, and wash hands!
Data/Results Table 1: Maximum Force of Static Friction (Sand Paper) Trial Mass Added (g) Maximum Force of Static Friction (N) 1 2 3 Table 2: Force of Kinetic Friction (Sand Paper) Trial Time (s) Distance (m) Force of Kinetic Friction (N) 1 2 3 Table 3: Maximum Force of Static Friction (Aluminum Foil) Trial Mass Added (g) Maximum Force of Static Friction (N) 1 2 3 Table 4: Force of Kinetic Friction (Aluminum Foil) Trial Time (s) Distance (m) Force of Kinetic Friction (N) 1 2 3
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