Physics

Problem

Two measurements on the same rough surface give the following data: • when

N = 8.0\,\text{N}

, the limiting friction is

3.3\,\text{N}

• when

N = 20.0\,\text{N}

, the limiting friction is

8.2\,\text{N}

Each force reading has an uncertainty of

\pm 0.1\,\text{N}

. The best estimate of the coefficient of static friction and its percentage uncertainty is a)

\mu_s \approx 0.41

with about

2\%

uncertainty b)

\mu_s \approx 0.50

with about

2\%

uncertainty c)

\mu_s \approx 0.41

with about

4\%

uncertainty d)

\mu_s \approx 0.41

with about

8\%

uncertainty