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y Bookmarks Window Help saplinglearning.com 7/14/2017 10:00 PM 076.7/1007/11/2017 02:54 PM Gradeboo Print Calculator Perlodic Table Print Calcuiaor ,nd Periodic Table Sapling Learning Map Many physical properties, such as force and mass, cannot be measured directly. Rather, some other physical property is measured and the desired physical property computed from the results. For example, a bathroom scale does not actually measure mass or "weight, but rather the compression distance of a spring, The numerical values on the scale are calibrated from the compression distance using basic physics principles such as Newton's second law. Coefficients of friction cannot be measured directly. In this problem, we are going to learn how we can indirectly measure the coefficient of kinetic friction between two surfaces by directly measuring the expansion of a spring Consider a 3.23 kg block that is dragged by a spring on a (relatively) frictionless horizontal surface at constant velocity. Suppose the block reaches a coefficient of kinetic friction between the 172.0 N/m. patch and the spring stretches by 3.25 cm. Compute the block and the rough patch if the spring has a force constant of Number 0.18 There is additional feedback View this feedback by clicking on the bottom divider bar on the divider bar again to hide the addtional feedback Incorrect Glose O Previous # Try Again O Next Exit

Explanation / Answer

Applying Work - energy theorem,

Work done by spring + work done by friction = change in KE

k x^2 /2 - f.x = 0 - 0

x ( k x / 2 - f ) = 0

f = (172)(0.0325) / 2 = 2.795 N

and f= u N = u m g

2.795 = u x 3.23 x 9.8

u = 0.088 .......Ans

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