Experimental Design PART A: Explain how the student can use this setup to take measurements that would allow the coefficient of static friction to be calculated. Be sure to explain clearly what rotational period must be measured and how experimental error can be reduced.

College Physics
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ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
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Scenario

Astudent is attempting to determine the coefficient of static fraction between a coin and a steel plate. the student attaches the center of the plate to a freely rotating axis. For each trial, the student sets the coin on different positions on the steel plate and measures the distances from the center of the coin to the center of the axis of rotation. The student also has a stopwatch to measure the periodT of the plate's rotation. 

Part A Experimental Design

Explain how the student can use the setup to take measurements that would allow the coefficient of static friction to be calculated. Be sure to explain clearly what rotational period must be measured and how experimental error can be reduced.

3
Circular Motion and Gravitation 3.K Friction as the Centripetal Force
UNIT
NAME
DATE
Scenario
A student is attempting to determine the coefficient of static
friction u̟ between a coin and a steel plate. The student
attaches the center of the plate to a freely rotating axis. For
each trial, the student sets the coin on different positions on the
steel plate and measures the distance r from the center of the
coin to the center of the axis of rotation. The student also has a
stopwatch to measure the period T of the plate's rotation.
m
T
Experimental Design
PART A: Explain how the student can use this setup to take measurements that would allow the coefficient
of static friction to be calculated. Be sure to explain clearly what rotational period must be measured
and how experimental error can be reduced.
Quantitative Analysis
PART B: Starting with Newton's laws and basic equations for circular motion, derive an equation that
relates u, r, T, and fundamental constants.
80
Return to Table of Contents
Return to Table of Contents
Transcribed Image Text:3 Circular Motion and Gravitation 3.K Friction as the Centripetal Force UNIT NAME DATE Scenario A student is attempting to determine the coefficient of static friction u̟ between a coin and a steel plate. The student attaches the center of the plate to a freely rotating axis. For each trial, the student sets the coin on different positions on the steel plate and measures the distance r from the center of the coin to the center of the axis of rotation. The student also has a stopwatch to measure the period T of the plate's rotation. m T Experimental Design PART A: Explain how the student can use this setup to take measurements that would allow the coefficient of static friction to be calculated. Be sure to explain clearly what rotational period must be measured and how experimental error can be reduced. Quantitative Analysis PART B: Starting with Newton's laws and basic equations for circular motion, derive an equation that relates u, r, T, and fundamental constants. 80 Return to Table of Contents Return to Table of Contents
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