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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
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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