You are trying to move a heavy packing case. You pull it and push it (Figures 52a and 52b respectively), and find that a smaller force is required to make it slide if you are pulling. (a) Explain this in qualitative terms only. (b) If the coefficient of friction between case and floor is u and the weight of the case is W, find an algebraic expression for the force H required to move the case when pulling. (c) Find the equivalent expression when pushing. (Hint: the push is a negative pull.)

You are trying to move a heavy packing case. You pull it and push it (Figures 52a and 52b respectively), and find that a smaller force is required to make it slide if you are pulling. (a) Explain this in qualitative terms only. (b) If the coefficient of friction between case and floor is u and the weight of the case is W, find an algebraic expression for the force H required to move the case when pulling. (c) Find the equivalent expression when pushing. (Hint: the push is a negative pull.)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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