2. Angle for Minimum Force. A box with weight w is pulled at constant speed along a
level floor by a force F that is at an angle above the horizontal. The coefficient of
kinetic friction between the floor and box is k (a) In terms of , k , and w, calculate
F.(b)Forw=400Nand k =0.25,calculate F forrangingfrom0to90in
increments of 10 . Graph F versus . (c) From the general expression in part (a),
calculate the value of for which the value of F , required to maintain constant speed, is a minimum.
2. Angle for Minimum Force. A box with weight w is pulled at constant speed along alevel floor by a force F that is at an angle above the horizontal. The coefficient ofkinetic friction between the floor and box is k (a) In terms of , k , and w, calculate F.(b)Forw=400Nand k =0.25,calculate F forrangingfrom0to90in increments of 10 . Graph F versus . (c) From the general expression in part (a), calculate the value of for which the value of F , required to maintain constant speed, is a minimum.
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