fficient of static friction between your textbook\'s cover and three different o
ID: 1418008 • Letter: F
Question
fficient of static friction between your textbook's cover and three different objects (naked cell phone, cell phone w/ case,ca coin, another book, etc.--use your imagination!) object of choice just barely hangs on without slipping. (You will Method: Measure the critical angle at w need a correctly-positioned protractor for this; or else a trigonometric measurement & ratio.) Repeat five times for each object, take the average of the angles, and find ,. Calculate Og and Og for the angles, and then apply the confidence interval to the friction coefficient. Repeat this process for each object. Present your data and calculated values in a neatly organized table, similar to a lab report.
Explanation / Answer
For naked cell phone
=> critical angle for slipping = 35 degree
=> coefficient of static friction = tan(35)
= 0.7
For cell phone with case
=> critical angle for slipping = 40 degree
=> coefficient of static friction = tan(40)
= 0.84
For calculator
=> critical angle for slipping = 32 degree
=> coefficient of static friction = tan(32)
= 0.624
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