Physics Lab

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timer Asked: Mar 18th, 2016
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Question Description

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Lab 4 Friction PHY250L Student Name: Click here to enter text. Kit Code (located on the lid of your lab kit): Click here to enter text. “Pre-Lab Questions” 1. “If the normal force perpendicular to a surface, what happens to the magnitude of the normal force on an object as the angle of the incline is increased?” Click here to enter text. 2. “Applying Newton’s Second Law and the equation for static friction (F = μsN)₁ prove that the coefficient of static friction (μs) is related to the minimum angle, θ, that causes the block to slip (Figure 5) by the equation μs = tan(θ).” Click here to enter text. 3. “A person applied a horizontal force to a crate of mass, m, that caused the crate to move at a constant velocity (Figure 6). Show that the relationship between the applied force and the normal force is FA = μFN.” Click here to enter text. “Experiment 1: Static Friction and Mass on an Inclined Plane” “Table 1: Wooden Block Incline Data” “Table 2: Metal Washer Incline Data” “Trial” “Angle” “Trial” “Angle” “1” Click here to enter text. “1” Click here to enter text. “2” Click here to enter text. “2” Click here to enter text. “3” Click here to enter text. “3” Click here to enter text. “4” Click here to enter text. “4” Click here to enter text. “5” Click here to enter text. “5” Click here to enter text. Lab 4 Friction PHY250L “Post-Lab Questions” 1. “Using the result from Pre-Lab Question 2, calculate the coefficient of friction for each angle in Table 1 and Table 2. Find the average value for the coefficient of friction for wood and metal on cardboard.” Click here to enter text. 2. “Comment on your coefficients of static friction for wood and metal. If they are different, why do you think they are different? If they are the same, why do you think they are the same?” Click here to enter text. “Experiment 2: Static Friction vs. Kinetic Friction” “Table 3: Peak Static Frictional Force” Total Mass (kg) Click here to enter text. Click here to enter text. Click here to enter text. Trial 1 (N) Trial 2 (N) Trial 3 (N) Average (N) Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. “Table 4: Kinetic Frictional Force” Total Mass (kg) Click here to enter text. Click here to enter text. Click here to enter text. “Trial 1 (N) “Trial 2 (N) Trial 3 (N) Average (N) Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. Click here to enter text. “Table 5: Static Frictional Force” Average Applied Force (N) Click here to enter text. Click here to enter text. Normal Force (N) Click here to enter text. Click here to enter text. “Table 6: Kinetic Frictional Force” Lab 4 Friction Click here to enter text. Click here to enter text. PHY250L Average Applied Force (N) Click here to enter text. Click here to enter text. Click here to enter text. Normal Force (N) Click here to enter text. Click here to enter text. Click here to enter text. “Post-Lab Questions” 1. “From the result from Pre-Lab Question 3, the relationship between the applied force and the normal force is FA = μFN. When the data for applied force vs normal force is plotted, the slope of the graph is equal to the coefficient of friction. Plot graphs of average force vs normal force from the data in Table 5 and Table 6.” “Insert photo of diagram with your name clearly visible in the background:”” “Insert photo of experimental setup with your name clearly visible in the background:”” Lab 4 Friction PHY250L

Tutor Answer

Jesse Jordan
School: UC Berkeley

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Anonymous
Goes above and beyond expectations !

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