# physics

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A 23 kg chair initially at rest on a horizontal
ﬂoor requires a 371 N horizontal force to set
it in motion. Once the chair is in motion, a
345 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?

• physics -

The force required to make it move is
F = (mu_s)*W = (mu_s)*M*g

M is the chair's mass. Solve for mu_s

For question (a), you don't need the force needed to keep it oving.

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