Question

A 23 kg chair initially at rest on a horizontal
ﬂoor requires a 370 N horizontal force to set
it in motion. Once the chair is in motion, a
332 N horizontal force keeps it moving at a
constant velocity.
The acceleration of gravity is 9.81 m/s
2
.
a) What is the coeﬃcient of static friction
between the chair and the ﬂoor?

Oct 18, 2012

F=F(fr)
370=μ(s)•m•g
μ(s)=370/mg,

μ(k)=332/mg,

Oct 18, 2012

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