(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A glider with mass 0.200kg sits on a frictionless horizontal air track, connected to a spring with force constant k = 5.00N/m. You pull on the glider, stretching the spring 0.100m and then release it with no initial velocity. The air track is turned off, so there is a kinetic friction force acting on the glider. What must be the coefficient of kinetic friction uk between the air track and the glider so that the glider reaches x = 0 position with zero speed.

2. Relevant equations

U = 1/2kx^2

3. The attempt at a solution

U1 + U2 = K1 + K2

0 + 1/2(kx^2) + Wother = 0 + 0

-1/2(5.00N/m)(.100m)^2 = Ff (0.100m)

-1/2(5.00N/m)(.100m) = Ff

Ff = -0.25N

uk = 0.25N / (0.200kg*9.8m/s^2)

uk = 0.128

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# Homework Help: Elastic Potential Energy of a glider

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