Concept explainers
An object with weight W is dragged along a horizontal plane by a force acting along a rope attached to the object.
If the rope makes an angle θ with the plane, then the magnitude of the force is
where μ is a constant called the coefficient of friction.
(a) Find the rate of change of F with respect to θ.
(b) When is this rate of change equal to 0?
(c) If W = 50 lb and μ = 0.6, draw the graph of F as a function of θ and use it to locate the value of θ for which dF/dθ = 0. Is the value consistent with your answer to part (b)?
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Chapter 3 Solutions
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