A person pushes on a stationary 125-N box with a force of 77 N at 30∘ below the horizontal. The coefficient of static friction between the box and the horizontal floor is 1.18. What is the largest the friction force could be? The person now replaces his push with a 77 N pull at 30∘ above the horizontal. Find the normal force on the box in this case.

Glencoe Physics: Principles and Problems, Student Edition
1st Edition
ISBN:9780078807213
Author:Paul W. Zitzewitz
Publisher:Paul W. Zitzewitz
Chapter5: Displacement And Force In Two Dimensions
Section: Chapter Questions
Problem 99A
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A person pushes on a stationary 125-N box with a force of 77 N at 30∘ below the horizontal. The coefficient of static friction between the box and the horizontal floor is 1.18. What is the largest the friction force could be? The person now replaces his push with a 77 N pull at 30∘ above the horizontal. Find the normal force on the box in this case.

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