To understand the role of friction in a state of
equilibrium.
A chair weighing 105 NN rests on a level floor
that is not frictionless. A man pushes on the chair with a
force FFF = 40.0 NN that is directed at an
angle of 40.0 ∘∘ with the horizontal.(Figure
1) Assume that the chair is stationary but is on the verge of
sliding.
a) Using Newton's laws, calculate NNN, the magnitude
of the normal force that the floor exerts on the chair.
b) What is the coefficient of static
friction, μsμsmu_s, between the floor and the chair? Recall
that the chair is on the verge of sliding.
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